MedTerms Dictionary
- A (adenine)
- A-
- a-
- A-T
- a.c.
- AAA
- AAAS
- AAD
- AAFP (American Academy of Family Physicians)
- AAMC (Ass Am Medical Colleges)
- AANAT
- AAO
- AAOS (American Academy of Orthopaedic Surgeons)
- AAP
- Aarskog syndrome
- Aarskog-Scott syndrome
- Aase-Smith syndrome I
- Aase-Smith syndrome II
- Ab ovo
- Ab-
- Abate
- Abatement
- Abdomen
- Abdomen, acute
- Abdominal
- Abdominal aneurysm
- Abdominal aorta
- Abdominal aortic aneurysm
- Abdominal cavity
- Abdominal guarding
- Abdominal hysterectomy
- Abdominal muscle deficiency syndrome
- Abdominal muscles
- Abdominal pain
- Abducent nerve
- Abduction
- Abductor muscle
- Aberration
- ABG (arterial blood gas)
- Abiological
- Abiotic
- Abiotrophy
- Ablate
- Ablation
- Ablation, endometrial
- Abnormal
- ABO blood group
- Abortifacient
- Abortion
- Abortion, artificial
- Abortion, habitual
- Abortion, induced
- Abortion, multiple
- Abortion, recurrent
- Abortion, spontaneous
- Abortion, therapeutic
- Abortive
- Abortive polio
- ABR test
- Abraham-man
- Abrasion
- Abrin
- Abruptio (abruptio placentae)
- Abruption
- Abs
- Abscess
- Abscess, breast
- Abscess, perianal
- Abscess, peritonsillar
- Abscess, skin
- Abscission
- Abse
- Abse, Dannie
- Absence of the breast
- Absence of the nipple
- Absence seizure
- Absent eye
- Absenteeism
- Absinthe
- Absinthism
- Absolute CD4 count
- Absolute neutrophil count
- Absorb
- Absorbed dose
- Absorption
- Abstemious
- Abstinence
- Abstinence, periodic
- Abuse, child
- Abuse, elder
- Abuse, emotional child
- Abuse, physical child
- Abuse, pregnancy
- Abuse, psychological child
- Abuse, sexual child
- Abuse, steroid
- Abuse, substance
- Abuse, verbal child
- Abused inhalant
- AC
- AC joint
- Acanthamoeba
- Acanthamoeba keratitis
- Acanthosis nigricans
- Acapnia
- Acaricide
- Acathisia
- ACC
- Accelerated phase of leukemia
- Acceptable daily intake
- Access
- Accessibility of services
- Accessory
- Accessory digestive organ
- Accessory dwelling unit
- Accessory nerve
- Accessory neuropathy
- Accessory placenta
- Acclimatization to altitude
- Accommodation
- Accoucheur
- Accoucheuse
- ACE2 (angiotensin converting enzyme 2)
- ACEI
- Acellular
- Acellular vaccine
- Acentric chromosome
- Aceruloplasminemia
- Acetabular
- Acetabular labrum
- Acetabulum
- Acetaminophen
- Acetate
- Acetic acid
- Acetoacetate
- Acetone
- Acetyl CoA
- Acetyl coenzyme A
- Acetyl phosphate
- Acetylcholine
- Acetylcholinesterase
- Acetylcysteine
- ACG2
- ACh (acetylcholine)
- Achalasia
- AChE (acetylcholinesterase)
- Achilles tendon
- Achilles tendonitis
- Achillobursitis
- Achillodynia
- Achlorhydria
- Achondrogenesis
- Achondrogenesis type II
- Achondrogenesis, Langer-Saldino type
- Achondrogenesis-hypochondrogenesis, type II
- Achondroplasia
- Achoo syndrome
- Achromatopsia
- Achromycin
- Acid deposition
- Acid indigestion
- Acid phosphatase
- Acid rain
- Acid reflux
- Acid, amino
- Acid, bile
- Acid, fatty
- Acid, folic
- Acid, nucleic
- Acid, pantothenic
- Acid, trans fatty
- Acid-base balance
- Acidophilus
- Acidosis
- Acinetobacter
- Acinus, pulmonary
- ACL
- ACL injury
- Acne
- Acne rosacea
- Acne vulgaris
- ACOG (Amer College of Ob & Gyn)
- Acou-
- Acoustic
- Acoustic aphasia
- Acoustic nerve
- Acoustic neurinoma
- Acoustic neurofibromatosis
- Acoustic neuroma
- ACP (American College of Physicians)
- Acquired
- Acquired deafness
- Acquired epileptiform aphasia
- Acquired immunity
- Acquired immunodeficiency syndrome
- Acquired mutation
- Acral-lentiginous melanoma
- Acrocentric chromosome
- Acrocephalosyndactyly
- Acrochordon
- Acrocyanosis
- Acrodermatitis enteropathica
- Acrodynia
- Acromegaly
- Acromioclavicular joint
- Acromion
- Acrophobia
- Acrylamide
- ACS (American Cancer Society)
- ACS (American College of Surgeons)
- Actinic
- Actinic keratosis
- Actinomycetes
- Activated charcoal
- Activated leukocyte cell adhesion molecule
- Active euthanasia
- Active immunity
- Active tuberculosis
- Activities of daily living (ADLs)
- Activity, drug
- Acu-
- Acuity test, visual
- Acuity, auditory
- Acuity, visual
- Acupressure
- Acupuncture
- Acupuncturist
- Acustimulation
- Acute
- Acute abdomen
- Acute angle-closure glaucoma
- Acute bacterial prostatitis
- Acute brain syndrome
- Acute bronchitis
- Acute confusional state
- Acute coronary syndromes
- Acute epiglottitis
- Acute fatty liver of pregnancy
- Acute HIV infection
- Acute idiopathic polyneuritis
- Acute illness
- Acute kidney failure
- Acute leukemia
- Acute lymphoblastic leukemia
- Acute lymphocytic leukemia
- Acute membranous gingivitis
- Acute mountain sickness (AMS)
- Acute myelogenous leukemia
- Acute myeloid leukemia
- Acute myocardial infarction
- Acute necrotizing ulcerative gingivitis (ANUG)
- Acute nonlymphocytic leukemia
- Acute otitis media
- Acute pain
- Acute pancreatitis
- Acute phase protein
- Acute phase reactant
- Acute promyelocytic leukemia
- Acute radiation syndrome
- Acute renal failure
- Acute respiratory disease
- Acute respiratory distress syndrome
- Acute stress disorder
- Acute thrombocytopenic purpura
- Acute tubular necrosis
- Acute-phase protein
- Acute-phase proteins
- Acute-phase reactant
- Acyclovir
- Ad lib
- Ad-
- ADA (American Dental Association)
- ADA (American Diabetes Association)
- ADA deficiency
- Adam's apple
- Adamantine
- Adams-Stokes disease
- ADAMTS2
- Adapter protein
- ADCC (antibody-dependent cell-mediated cytotox.)
- ADD (attention deficit disorder)
- Addiction
- Addiction, computer
- Addison anemia
- Addison disease
- Addisonian anemia
- Additive genetic effects
- Adducted thumbs with mental retardation
- Adduction
- Adductor muscle
- Aden-
- Adenine (A)
- Adenitis
- Adeno-
- Adenocarcinoma
- Adenoid cystic carcinoma
- Adenoidectomy
- Adenoiditis
- Adenoids
- Adenoids and Tonsils
- Adenoma
- Adenoma colon family history
- Adenomatous polyposis coli
- Adenomatous polyposis coli, autosomal recessive
- Adenomyoma
- Adenomyomata
- Adenomyosis
- Adenomyosis uteri
- Adenopathy
- Adenosine
- Adenosine deaminase (ADA)
- Adenosine deaminase (ADA) deficiency
- Adenosine thallium scan
- Adenosine triphosphate
- Adenovirus
- ADH (antidiuretic hormone)
- ADH secretion, inappropriate
- ADHD
- Adhesion
- Adhesive capsulitis
- ADI
- Adipocyte
- Adiponectin
- Adipose
- Adipose most abundant gene transcript 1
- Adjacent
- Adjuvant
- Adjuvant chemotherapy
- Adjuvant therapy
- ADLs (activities of daily living)
- Admission
- Admitting physician
- Adnexa
- Adoption medicine
- Adrenal cortex
- Adrenal failure
- Adrenal gland
- Adrenal medulla
- Adrenaline
- Adrenoleukodystrophy
- ADU
- Adult ADHD
- Adult primary liver cancer
- Adult respiratory distress syndrome
- Adult T-cell leukemia
- Adult T-cell leukemia/lymphoma
- Adult T-cell lymphoma
- Adult-onset diabetes
- Adult-onset Still disease
- Advance directives
- Advance grief
- Advance medical directives
- Advanced maternal age
- Advanced paternal age
- Adventitia
- Adventitious
- Adverse drug event
- Adverse drug reaction
- Adverse effect
- Adverse event
- Adverse reaction
- AED (automated external defibrillator)
- Aer-, aero-
- Aerobic
- Aerobic exercise
- Aeromonas hydrophila
- Aerophagia
- Aerophobia
- Aerosinusitis
- Aerosol
- Aerosolization
- Aerospace medicine
- Aerotitis
- Aerotitis media
- Aesculapius
- Aetiology
- AFAP
- Affect
- Affective disorder, seasonal (SAD)
- Afferent
- Afferent nerve
- Afferent vessel
- Affinity
- Affordable Care Act
- AFIP
- Aflatoxin
- AFO (ankle-foot orthosis)
- AFP (alpha-fetoprotein)
- African American
- African sleeping sickness
- African tapeworm
- African tick typhus
- African trypanosomiasis
- African-American
- Afterbirth
- Agammaglobulinemia
- Age by decade
- Age of mother
- Age of father
- Age-related deafness
- Age-related macular degeneration
- Agency for Toxic Substances and Disease Registry
- Agenesis
- Agenesis of the corpus callosum
- Agenesis of the gallbladder
- Agenesis, sacral
- Agent Orange
- Agent, anti-infective
- Agent, antibiotic
- Agent, antifungal
- Agent, antihypertensive
- Agent, antimicrobial
- Agent, antiprotozoal
- Agent, antiviral
- Agent, tocolytic
- Ageusia
- Aggressive
- Aggressive angiomyxoma
- Aggressive lymphoma
- Aging
- Aging, National Institute on
- Agita
- Agitated depression
- Agnate
- Agnosia
- Agonist
- Agonist maintenance treatment
- Agonist, LHRH
- Agoraphobia
- Agranulocytosis
- Agranulocytosis, infantile genetic
- Agreement, arbitration
- Ague
- AGXT
- Agyrophobia
- AHC
- AHD
- Aicardi syndrome
- AID (artificial insemination by donor)
- Aid, vibrotactile
- AIDS
- AIDS dementia complex
- AIDS wasting syndrome
- AIDS-related complex
- AIH (artificial insemination by husband)
- Ailurophobia
- Air bag
- Air-conditioner lung
- Airway
- Airway obstruction
- AK
- AKA (above the knee amputation)
- Akathisia
- Akinesia
- Akinetic
- Akinetic mutism
- AKU
- ALA
- Alagille syndrome
- Alanine
- Alanine aminotransferase (ALT)
- Alarm clock headache
- Alb-
- Albert Sabin
- Albinism
- Albinism and hemorrhagic diathesis
- Albinism, oculocutaneous
- Albino
- Albright syndrome
- Albuginea
- Albumen
- Albumin
- Albuminuria
- ALCAM
- Alcohol
- Alcohol abuse
- Alcohol Abuse and Alcoholism, National Institute
- Alcohol poisoning
- Alcohol, pregnancy
- Alcoholics Anonymous
- Alcoholism
- Aldose reductase inhibitor
- Aldosterone
- Aldosteronism
- Aldrin
- Alembic
- Aleut health
- Alexander disease
- Alexander technique
- Alexia
- algia
- Algophobia
- Alice in Wonderland syndrome
- Alice Stewart
- Alien hand syndrome
- Alienist
- Alimentary
- Alimentary canal
- Alkaline phosphatase
- Alkaloid
- Alkaloid, vinca
- Alkalosis
- Alkaptonuria
- Alkyl group
- Allele
- Allelic
- Allergen
- Allergic conjunctivitis
- Allergic contact dermatitis
- Allergic contact eczema
- Allergic granulomatosis
- Allergic granulomatous angiitis
- Allergic purpura
- Allergic reaction
- Allergic rhinitis
- Allergic rhinitis, perennial
- Allergic rhinitis, seasonal
- Allergic salute
- Allergic vasculitis
- Allergy
- Allergy and Infectious Diseases, National Inst.
- Allergy desensitization
- Allergy immunotherapy
- Allergy scratch test
- Allergy shots
- Allergy skin test
- Allergy to cockroaches
- Allergy, cow milk
- Allergy, honey bee
- Allergy, peanut
- Allergy, soy milk
- Allodynia
- Alloerotic
- Allogeneic
- Allogeneic graft
- Allograft
- Allopath
- Allopathic
- Allopathic medicine
- Allopathist
- Allopathy
- ALMS1
- Alogia
- Alopecia
- Alopecia areata
- Alopecia capitis totalis
- Alopecia universalis
- Alopecia, traumatic
- Alpers disease
- Alpha blocker
- Alpha cell, pancreatic
- Alpha error
- Alpha helix
- Alpha interferon
- Alpha linolenic acid
- Alpha Omega Alpha
- Alpha particle
- Alpha synuclein
- Alpha thalassemia
- Alpha-1
- Alpha-1 antitrypsin deficiency
- Alpha-defensin
- Alpha-ET
- Alpha-ethltryptamine
- Alpha-fetoprotein (AFP)
- Alpha-glucosidase inhibitor
- Alpha-linolenic acid
- Alpha-synuclein
- Alport syndrome
- Alprazolam
- ALPS
- ALS
- ALS1
- ALS2
- ALS3
- ALS4
- ALS5
- ALS6
- ALS7
- ALS8
- Alstrom syndrome
- Alstrom-Hallgren syndrome
- ALT (alanine aminotransferase)
- Alternate hemiplegia
- Alternating hemiplegia of childhood
- Alternating hemiplegia syndrome
- Alternative medical system
- Alternative medicine
- Alternative Medicine, National Center for Compleme
- Alternative splicing
- Altitude illness
- Altitude sickness
- Altitude, acclimatization to
- Altitude, high
- Aluminum
- Aluminum poisoning
- Aluminum toxicity
- Alveolar
- Alveolar hydatid disease
- Alveolar proteinosis
- Alveoli
- Alveolitis
- Alveolus
- Alzheimer disease
- Alzheimer disease, early-onset familial
- Alzheimer's disease
- Am
- AMA
- Amalgam
- Amastia
- Amathophobia
- Amaurosis fugax
- Amaurotic familial idiocy
- Amazia
- Ambidextrous
- Ambient
- Ambiguous genitalia
- Amblyopia
- Amblyopia, nocturnal
- Ambulance
- Ambulant
- Ambulatory
- Ambulatory care
- AMC (arthrogryposis multiplex congenita)
- AMD
- Ameba
- Amebiasis
- Amebic colitis
- Amebic dysentery
- Amelanotic
- Amelanotic melanoma
- Amelioration
- Amenia
- Amenorrhea
- Amer College of Ob and Gyn (ACOG)
- American Academy of Family Physicians (AAFP)
- American Academy of Orthopaedic Surgeons
- American Academy of Pediatrics
- American Association for Advancement of Science
- American Association of Dermatology
- American Cancer Society (ACS)
- American College of Nurse-Midwives
- American College of Physicians
- American College of Surgeons (ACS)
- American Dental Association (ADA)
- American Diabetes Association (ADA)
- American dog tick
- American Journal of Public Health
- American Medical Association
- American medical school, first
- American Psychiatric Association
- American Sign Language
- American trypanosomiasis
- American Type Culture Collection (ATCC)
- Americium
- Ames test
- Ames, Bruce N.
- AMI
- Amine
- Amini
- Amini, Fariborz
- Amino acid
- Amino acid symbols
- Amino acid, branched-chain
- Amino acid, essential
- Amino acid, nonessential
- Amino acids
- Aminotransferase
- Amitriptyline
- AML
- AML1
- Ammonia
- Ammonium perchlorate
- Amnesia
- Amnesia, antegrade
- Amnesia, anterograde
- Amnesia, retrograde
- Amnesia, transient global
- Amnesic aphasia
- Amnestic aphasia
- Amniocentesis
- Amnion
- Amnioreduction
- Amniotic fluid
- Amniotic sac
- Amoeba
- Amok
- Amphetamine
- Amplification
- Amplification, DNA
- Ampulla
- Ampulla of Vater
- Ampullary carcinoma
- Amputation
- AMS (acute mountain sickness)
- AMS (atypical measles syndrome)
- Amsler grid
- Amuck
- Amusia
- Amygdala
- Amygdaloid
- Amygdaloid body
- Amygdaloid complex
- Amygdaloid nucleus
- Amyl-
- Amylase
- Amylo-
- Amyloid
- Amyloidosis
- Amyloidosis, hereditary
- Amyloidosis, primary
- Amyloidosis, secondary
- Amyotrophic lateral sclerosis (ALS)
- Amyotrophic lateral sclerosis 1
- Amyotrophic lateral sclerosis 2
- Amyotrophic lateral sclerosis 3
- Amyotrophic lateral sclerosis 4
- Amyotrophic lateral sclerosis 5
- Amyotrophic lateral sclerosis 6
- Amyotrophic lateral sclerosis 7
- Amyotrophic lateral sclerosis 8
- An-
- ANA
- Anaerobic
- Anaesthesia
- Anal atresia
- Anal fissure
- Anal fistula
- Anal incontinence
- Anal itching
- Anal papilla
- Anal papillae
- Analbuminemia
- Analgesia
- Analgesic
- Analgesic drug
- Analog
- Analogous
- Analysis
- Analysis, linkage
- Analytic sensitivity
- Analytic specificity
- Anaphia
- Anaphylactic shock
- Anaphylactoid purpura
- Anaphylaxis
- Anaplasmosis
- Anaplastology
- Anaptic
- Anastomosis
- Anastrozole
- Anat.
- Anatomic orientation terms
- Anatomical position
- Anatomical snuffbox
- Anatomy
- Anatomy in the Bible
- Anatomy, Gray's
- Anatomy, gross
- Anatomy, microscopic
- Anatripsis
- ANC
- Ancylostoma infection
- Anderson-Fabry disease
- Androgen
- Androgen ablation
- Androgen insensitivity syndrome, complete
- Androgen suppression
- Androgen suppression therapy
- Androgenic
- Android pelvis
- Andrology
- Androphobia
- Androstenedione
- Anemia
- Anemia and triphalangeal thumbs
- Anemia, Addison
- Anemia, addisonian
- Anemia, aplastic
- Anemia, Biermer's
- Anemia, congenital
- Anemia, Cooley's
- Anemia, Fanconi
- Anemia, iron deficiency
- Anemia, Mediterranean
- Anemia, pernicious
- Anemia, refractory
- Anemia, sickle cell
- Anemic
- Anencephaly
- Anergy
- Anesthesia
- Anesthesia awareness
- Anesthesia, caudal epidural
- Anesthesiologist
- Anesthesiology
- Anesthetic
- Anesthetic, epidural
- Anesthetic, general
- Anesthetic, local
- Anesthetist
- Anetoderma
- Aneuploidy
- Aneurysm
- Aneurysm, abdominal
- Aneurysm, aortic
- Aneurysm, arterial
- Aneurysm, arteriosclerotic
- Aneurysm, atherosclerotic
- Aneurysm, berry
- Aneurysm, brain
- Aneurysm, cardiac
- Aneurysm, dissecting
- Aneurysm, fusiform
- Aneurysm, miliary
- Aneurysm, racemose
- Aneurysm, renal
- Aneurysm, saccular
- Aneurysm, thoracic
- Aneurysm, venous
- Aneurysmal bruit
- Anfinsen
- Angelman syndrome
- Anger
- Angiitis
- Angiitis, allergic granulomatous
- Angina
- Angina pectoris
- Angina trachealis
- Angina, exudative
- Angina, Prinzmetal
- Angina, variant
- Angina, Vincent
- Angioedema
- Angioedema, hereditary
- Angiogenesis
- Angiogram
- Angiography
- Angiography, coronary
- Angiography, fluorescein
- Angiohemophilia
- Angioid streaks
- Angiokeratoma corporis diffusum universale
- Angiomatosis, bacillary
- Angiomyxoma, aggressive
- Angioneurotic edema, hereditary
- Angiopathy
- Angioplasty
- Angiosarcoma
- Angiostatin
- Angiostrongyliasis
- Angiostrongylus infection
- Angiotensin
- Angiotensin converting enzyme
- Angiotensin converting enzyme 2
- Angiotensin receptor blocker
- Angle-closure glaucoma
- Angle-closure glaucoma, acute
- Angry
- Anhedonia
- Anhidrosis
- Anhidrotic
- Aniline
- Animal-to-human transplant
- Anion
- Anion gap
- Aniso
- Aniso-
- Anisocoria
- Anisocytosis
- Anisometropia
- Ankle
- Ankle bone
- Ankle joint
- Ankle pain
- Ankle sprain
- Ankle twist
- Ankle-foot orthosis
- Ankyloglossia
- Ankylose
- Ankylosing
- Ankylosing spondylitis
- Ankylosis
- Ankyrin deficiency
- Anlage
- Anlagen
- ANLL
- Annals of Internal Medicine
- Annexin A1
- Annexin V
- Annexins
- Annotate
- Annotation
- Annotation, genome
- Annular pancreas
- Annulus
- Anogenital tract
- Anomalad, Klippel-Feil
- Anomaly
- Anomaly, congenital
- Anomaly, Klippel-Feil
- Anomia
- Anomic aphasia
- Anonymize
- Anonymous reporting
- Anonymous testing
- Anophthalmia
- Anorectic
- Anorexia
- Anorexia nervosa
- Anorexia, cancer
- Anorexic
- Anorexigenic
- Anorgasmia
- Anorgasmy
- Anoscope
- Anoscopy
- Anosmia
- Anotia
- Anovular
- Anovular menstruation
- Anovulatory
- Anoxia
- Anoxic
- Ant, fire
- Antagonist
- Antean
- Antegrade
- Antegrade amnesia
- Antenatal surgery
- Anterior
- Anterior chamber
- Anterior cruciate injury
- Anterior cruciate ligament
- Anterior pituitary
- Anterior tongue
- Antero-
- Anterograde
- Anterograde amnesia
- Anterograde memory
- Anteroposterior
- Anteroposterior (AP)
- Anthophobia
- Anthracycline
- Anthrax
- Anthrax immunization
- Anthrax toxin
- Anthropology, forensic
- Anti CCP
- Anti-
- Anti-angiogenesis drugs
- Anti-CCP
- Anti-citrulline antibody
- Anti-cyclic citrullinated peptide antibody
- Anti-emetic
- Anti-infective
- Anti-platelet agents
- Anti-reflux surgery (fundoplication)
- Antiandrogen
- Antiatherogenic mutation
- Antibacterial
- Antibiotic
- Antibiotic resistance
- Antibiotic-resistant tuberculosis
- Antibody
- Antibody cross reactivity
- Antibody, antinuclear
- Antibody, antithyroglobulin
- Antibody-dependent cell-mediated cytotoxicity
- Anticholinergic
- Anticipation
- Anticipatory grief
- Anticoagulant
- Anticoagulant agent
- Anticonvulsant
- Antidepressant
- Antidepressant, MAOI
- Antidepressant, SSRI
- Antidepressant, tricyclic
- Antidepressants
- Antidiabetic agent
- Antidiuretic hormone (ADH)
- Antidote
- Antielastase
- Antiemetics
- Antiestrogen
- Antifreeze poisoning
- Antifungal
- Antifungal agent
- Antifungal drug
- Antifungal medication
- Antigen
- Antigen, prostate specific
- Antigen-antibody complex
- Antigen-presenting cell
- Antigenic drift
- Antigenic shift
- Antihistamines
- Antihypertensive
- Antiinfective
- Antimalarial
- Antimetabolite
- Antimicrobial
- Antimicrobial agent
- Antimicrobial drug
- Antimicrobial medication
- Antimicrobial resistance
- Antimony
- Antineoplastic
- Antinuclear antibody
- Antinuclear antibody test
- Antioxidant
- Antiparallel
- Antiparasitic
- Antiphospholipid antibody syndrome
- Antiprotozoal
- Antiprotozoal drug
- Antipsoriatic
- Antipsychotic
- Antipyretic
- Antiretroviral
- Antiretroviral therapy (ART)
- Antisense
- Antisense DNA
- Antisense drug
- Antisense mRNA
- Antisense-strand RNA virus
- Antisepsis
- Antiseptic
- Antisocial personality
- Antisocial personality disorder
- Antispasmodic
- Antithymocyte globulin
- Antithyroglobulin
- Antithyroid antibody
- Antithyroid drug
- Antitoxin
- Antivenin
- Antiviral
- Antiviral agent
- Anton Chekhov
- Antonio Maria Valsalva
- Antonomasia
- Antonomastic
- Antonomasy
- Antro-duodenal motility study
- Antrum
- Ants, fire
- Ants, velvet
- ANUG (acute necrotizing ulcerative gingivitis)
- Anus
- Anus, imperforate
- Anvil
- ANXA1
- Anxiety
- Anxiety disorder
- Anxiety disorder, social
- AOA
- AOM
- Aorta
- Aorta, abdominal
- Aorta, ascending
- Aorta, coarctation of the
- Aorta, descending
- Aorta, thoracic
- Aortal
- Aortic
- Aortic aneurysm
- Aortic arch
- Aortic arch syndrome
- Aortic atresia
- Aortic dissection
- Aortic insufficiency
- Aortic regurgitation
- Aortic stenosis
- Aortic valve
- Aortic valve, bicuspid
- Aortitis
- AP
- AP (anteroposterior)
- AP, X-ray
- APA
- APC
- APC (gene)
- APC (immunology)
- APC (medication)
- APECED (autoimmune polyendocrinopathy)
- Aperient
- Apert syndrome
- Apert syndrome acrocephalosyndactyly
- Apex
- Apgar
- Apgar score
- Aphagia
- Aphakia
- Aphasia
- Aphasia, acquired epileptiform
- Aphasia, amnesic
- Aphasia, amnestic
- Aphasia, anomic
- Aphasia, nominal
- Aphasia, primary progressive
- Apheresis
- Aphonia
- Aphrasia
- Aphthous ulcer
- Apical
- Apiphobia
- Aplasia
- Aplasia of the breast
- Aplastic anemia
- APLS (antiphospholipid antibody syndrome)
- APM1
- Apnea
- Apnea, central sleep
- Apnea, obstructive sleep
- APO-1
- APOA-I
- ApoA-I Milano
- APOBEC3G
- Apolipoprotein A-I
- Apolipoprotein E
- Apollo
- Apopain
- Apophenia
- Apophysitis calcaneus
- Apoplexy
- Apoptosis
- Appendectomy
- Appendiceal
- Appendiceal cancer
- Appendiceal perforation
- Appendiceal rupture
- Appendicitis
- Appendix
- Appendix cancer
- Appendix epididymis
- Appendix epiploica
- Appendix perforation
- Appendix rupture
- Appendix testis
- Apposition
- Approved drug
- Apraxia
- Apraxia of speech
- APS (autoimmune polyglandular syndrome)
- APT1
- AQP
- Aquaphobia
- Aquaporin
- Aqueduct
- Aqueduct of Sylvius
- Aqueduct of the midbrain
- Aqueous humor
- Arabidopsis thaliana
- Arabidopsis thaliana genome
- Arachnodactyly
- Arachnoiditis
- Arachnophobia
- Arbitration agreement
- Arboviral encephalitis
- Arbovirus
- Arch, aortic
- Arch, vertebral
- Arch, zygomatic
- Archaea
- Archaeogenetics
- Archaeology
- Arcuate neuron
- Arcuate nucleus
- Arcus senilis
- ARD
- ARDS
- Areflexia
- Arenaviridae
- Arenavirus
- Areola
- Argentaffinoma
- Arginine
- Argon laser
- Argyria
- Arhythmia
- Arimidex
- Aristolochia fangchi
- Aristolochic acid
- Aristotle
- Arm
- ARM
- ARMD
- Armed Forces Institute of Pathology
- Armed tapeworm
- Arms
- Aromasin
- Aromatase
- Aromatase inhibitor
- Aromatherapy
- Arrayed library
- Arrector pili
- Arrectores pilorum
- Arrhythmia
- Arrhythmia, sinus
- Arrhythmias, atrial
- Arrhythmias, rapid
- Arrhythmias, slow
- Arrhythmias, ventricular
- ARS
- Arsenic
- Arsine
- ART (antiretroviral therapy)
- Artemidorus
- Artemisinin
- Artemsisia annua
- Arteria femoralis
- Arterial aneurysm
- Arterial blood gas (ABG)
- Arterial tension
- Arteries, coronary
- Arteriogram
- Arteriohepatic dysplasia
- Arteriole
- Arteriosclerosis
- Arteriosclerotic aneurysm
- Arteriosclerotic retinopathy
- Arteriovenous malformation
- Arteriovenous malformation (AVM)
- Arteritis, cranial
- Arteritis, giant cell
- Arteritis, Takayasu
- Arteritis, temporal
- Artery
- Artery disease, coronary
- Artery spasm, coronary
- Artery, brachial
- Artery, carotid
- Artery, central retinal
- Artery, femoral
- Artery, hepatic
- Artery, mesenteric
- Artery, ophthalmic
- Artery, pulmonary
- Artery, splenic
- Artery, vertebral
- Arth. and Musculoskeletal and Skin Dis, Nat'l Inst
- Arthr-
- Arthralgia
- Arthritis
- Arthritis in children
- Arthritis mutilans
- Arthritis, degenerative
- Arthritis, gout
- Arthritis, Lyme
- Arthritis, psoriatic
- Arthritis, quackery
- Arthritis, reactive
- Arthritis, Reiter
- Arthritis, rheumatoid
- Arthritis, spondylitis
- Arthritis, systemic-onset chronic rheumatoid
- Arthritis, systemic-onset juvenile rheumatoid
- Arthro-
- Arthrocentesis
- Arthrogryposis
- Arthrogryposis multiplex congenita (AMC)
- Arthropathy
- Arthroscope
- Arthroscopic
- Arthroscopy
- Arthrosis
- Artic health
- Articulation
- Articulation disorder
- Articulations of the body, principal
- Artificial abortion
- Artificial heart
- Artificial insemination
- Artificial insemination by donor (AID)
- Artificial insemination by husband (AIH)
- Artificial knee
- Artificial nose
- Artificial pacemaker
- Artificial pancreas
- Arylalkylamine N-acetyltransferase
- ASA (drug caution code)
- Asbestos
- Asbestosis
- Ascariasis
- Ascaris
- Ascending aorta
- Ascending pathway
- Ascites
- Asclepius
- Ascorbic acid
- Ascus
- ASCUS
- ASD
- Aseptic
- Aseptic bursitis
- Aseptic necrosis
- Asexual
- Asian cholera
- Asian flu
- Asian influenza
- ASL
- Asn
- ASOT
- Asp
- Asparagine
- Aspartame
- Aspartate aminotransferase (AST)
- Aspartic acid
- Asperger syndrome
- Asperger's syndrome
- Aspergillosis
- Aspergillus
- Asphyxia
- Aspie
- Aspirate
- Aspiration
- Aspiration pneumonia
- Aspiration, fine needle
- Aspiration, joint
- Aspirin
- Aspirin resistance
- Asplenia
- Asplenic
- Assay
- Assay, CEA
- Assay, NSE
- Assembly and budding
- Assembly, DNA
- Assignment of benefits
- Assistant in dying
- Assistant, physician (PA)
- Assisted living
- Assisted suicide
- Assistive device
- Assistive technology
- Association
- Association of American Medical Colleges
- Association, VATER
- AST
- Astatic seizure
- Asthenia
- Asthenic
- Asthma
- Asthma susceptibility gene
- Asthma, exercise-induced
- Asthma, miner's
- Asthma, thermally induced
- Asthmatic
- Astigmatic
- Astigmatism
- Astraphobia
- Astrocytoma
- Asymptomatic
- Asymptomatic infection
- Asystole
- AT (in DNA)
- Ataxia
- Ataxia telangiectasia mutated
- Ataxia, cerebellar
- Ataxia-telangiectasia
- ATCC (American Type Culture Collection)
- Atelectasis
- Atelectasis, primary
- Atelectasis, secondary
- ATG
- Athelia
- Atherectomy
- Atherogenesis
- Atheroma
- Atherosclerosis
- Atherosclerotic
- Atherosclerotic aneurysm
- Athetosis
- Athleats feet
- Athlete foot
- Athlete's feet
- Athlete's foot
- Athymic
- Athymic mouse
- Atkins diet
- Atlantoaxial
- Atlas
- Atlas and axis joint
- Atloaxoid joint
- ATM
- ATN
- Atom
- Atonia, REM sleep
- Atonic
- Atonic seizure
- Atopic
- Atopic dermatitis
- Atopy
- ATP
- Atresia
- Atresia, anal
- Atresia, aortic
- Atresia, biliary
- Atria
- Atrial
- Atrial arrhythmias
- Atrial fib
- Atrial fibrillation
- Atrial flutter
- Atrial septal defect (ASD)
- Atrial septum
- Atriodigital dysplasia
- Atrioventricular (AV)
- Atrioventricular node
- Atrium
- Atrophic vaginitis
- Atrophy
- Atrophy, peroneal muscular
- Atropine
- Atropine psychosis
- ATSDR
- Attack, vasovagal
- Attention
- Attention deficit disorder (ADD)
- Attention deficit hyperactivity disorder
- Attention getting
- Attentional
- Attenuate
- Attenuated
- Attenuated familial adenomatous polyposis
- Attenuated FAP
- Attenuated virus
- Atypical
- Atypical measles syndrome (AMS)
- Audiogram
- Audiologist
- Audiology
- Audiometry
- Auditory acuity
- Auditory aphasia
- Auditory brainstem response test
- Auditory cortex
- Auditory disease, central
- Auditory integration training
- Auditory perception
- Auditory prosthesis
- Auditory tube
- Aura
- Aural vertigo, recurrent
- Auricle
- Auricular
- Auscultate
- Austin Flint murmur
- Autism
- Autistic savant
- Autoantibody
- Autochthonous
- Autoclave
- Autogenous
- Autograft
- Autoimmune
- Autoimmune disease
- Autoimmune hemolytic anemia
- Autoimmune hepatitis
- Autoimmune lymphoproliferative syndrome (ALPS)
- Autoimmune polyendocrinopathy
- Autoimmune polyendocrinopathy syndrome
- Autoimmune polyglandular syndrome (APS)
- Autoimmune process
- Autoimmune thyroid disease
- Autoimmune thyroiditis
- Autoimmunity
- Autoinnoculation
- Autologous
- Autologous blood donation
- Autolysis
- Automated external defibrillator
- Automated white cell differential
- Automatic behavior
- Automatic seizure
- Automatism
- Autonomic failure
- Autonomic nervous system
- Autonomic neuropathy
- Autonomy, patient
- Autophobia
- Autopsy
- Autoradiography
- Autosomal
- Autosomal chromosome
- Autosomal dominant
- Autosomal dominant hereditary spastic paraplegia
- Autosomal dominant radial drusen
- Autosomal recessive
- Autosome
- Autotransplant
- Autotransplantation
- Aux-
- AV (atrioventricular)
- AV node
- Avascular necrosis
- Avascular necrosis of the femoral head
- Avery
- Avian flu
- Avian influenza
- Avian tuberculosis
- AVM
- AVM (arteriovenous malformation)
- AVN
- Avulse
- Avulsion
- Avuncular
- Axelrod
- Axelrod, Julius
- Axial tomography, computerized
- Axilla
- Axillary
- Axillary dissection
- Axillary hyperhidrosis
- Axis
- Axon
- Ayurveda
- Azoospermia
- Azotemia
- AZT