from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An iodine-containing hormone, C15H11I4NO4, produced by the thyroid gland, that increases the rate of cell metabolism and regulates growth and that is made synthetically for treatment of thyroid disorders.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A hormone (an iodine derivative of tyrosine), produced by the thyroid gland, that regulates cell metabolism and growth.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells


from The American Heritage® Dictionary of the English Language, 4th Edition

thyr(o)- + ox(y)- + in(dole).


  • The thyroid gland secretes an inactive thyroid hormone called thyroxine, also known as T4.

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  • Your brain needs thyroid hormone, called thyroxine or T4, to develop and function properly.

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  • It takes iodine from the food we eat to make iodine-containing hormones called thyroxine (T4) and triiodothyronine (T3).


  • Some, such as thyroxine, epinephrine, and histamine have molecules that are modifications of single amino acids; tyrosine in the first two cases, histidine in the last.

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  • In addition, many patients are being denied alternatives to thyroxine even when this is merited.

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  • The thyroid gland secretes two main hormones, thyroxine and triiodothyronine, into the bloodstream that stimulate all the cells in the body and control many biological processes such as growth, reproduction, development, and metabolism.

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  • TSH tells the thyroid to capture iodine from the blood to synthesize, store, and release thyroxine (T4).

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  • Iodine is required to make the thyroid's two principal products -- thyroxine (T4) and triiodothyronine (T3), generally known collectively as "thyroid hormone."

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  • Unfortunately, even when the disease is diagnosed correctly, the common treatment is just to replace the diminished thyroid hormone, usually with an oral tablet or pill of the thyroid hormone thyroxine (T4 or levothyroxine), a synthetic analog.

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  • Changes in serum thyroxine, triiodothyronine, and thyrotropin induced by lithium in normal subjects and in rats (The James A. Bush memorial research awards) by Connie Child

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