Medical Definition of Hormone, triiodothyronine

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Hormone, triiodothyronine: A hormone made by the thyroid gland. It has three iodine molecules attached to its molecular structure. Iodine is naturally found in seafood, bread, seaweed, and ordinary table salt.

Triiodothyronine is the most powerful thyroid hormone, and affects almost every process in the body, including body temperature, growth, and heart rate. Also known as T3, liothyronine.

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Reviewed on 12/12/2018

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