Definition: The stronger of the two key hormones produced by the thyroid gland, and also produced from the conversion of thyroxine (T4).
Also Known As: T3
Alternate Spellings: Tri-iodothyronine
Common Misspellings: Triodothyronine, 3T
Triiodothyronine - T3
By Mary Shomon, About.com Guide
Updated January 05, 2004
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
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