Definition of "triiodothyronine" []

• A thyroid hormone, C15H12I3NO4, similar to thyroxine but more potent, used in the treatment of hypothyroidism. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Normally, the inactive T4 is converted inside the cell to the active thyroid hormone called triiodothyronine (also known as T3)."
• "They found that cutting calories reduced two significant effects of aging, a thyroid hormone called triiodothyronine, which has been shown to help control cellular metabolism and energy balance in the body, and an inflammatory molecule called tumor necrosis factor alpha."
• "Iodine is required to make the thyroid's two principal products -- thyroxine (T4) and triiodothyronine (T3), generally known collectively as "thyroid hormone.""