Dictionary![]() ![]() tri•i•o•do•thy•ro•ninePronunciation: (trī"ī-ō"dō-thī'ru-nēn", -ī-od"ō-), [key] —n. 1. Biochem.a thyroid hormone, C15H12I3NO4, similar to thyroxine but several times more potent. 2. Pharm.a preparation of this hormone, used in treating hypothyroidism. Abbr.: T3 Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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