home > medterms medical dictionary a-z list > kb definition smallermediumlarger Definition of kb 19 Habits That Wreck Your Teeth Dental (Oral) Health Quiz Top Problems in Your Mouth Kb: Kilobase.Last Editorial Review: 7/1/2016 Search MedTerms:Back to MedTerms online medical dictionary A-Z List Need help identifying pills and medications? Use the pill finder tool on RxList. From Healthy Resources Assess Your MS Symptoms Talking to Your Doctor About PAH Diaper Rash: When to Call a Doctor. Featured Centers Feeling Short of Breath? What to Eat When You Have Cancer Top 3 Anaphylaxis Triggers Health Solutions From Our Sponsors Frequent Constipation? Knee Treatment Plan Exclusives What Does Psoriasis Look Like? How to Prevent Muscle Cramps Blood Clot? Know the Signs and Symptoms Allergy Triggers: Do You Know Yours?