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 (thī-rŏk′sēn′, -sĭn) also thy·rox·in (-rŏk′sĭn)
n. Abbr. T4
An iodine-containing hormone, C15H11I4NO4, produced by the thyroid gland, that increases the rate of cell metabolism and regulates growth. A synthetic form is used in the treatment of thyroid disorders.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(θaɪˈrɒksiːn; -sɪn) or


(Biochemistry) the principal hormone produced by the thyroid gland: it increases the metabolic rate of tissues and also controls growth, as in amphibian metamorphosis. It can be synthesized or extracted from the thyroid glands of animals and used to treat hypothyroidism. Chemical name: tetra-iodothyronine; formula: C15H11I4NO4
[C19: from thyro- + oxy-2 + -ine2]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(θaɪˈrɒk sin, -sɪn)

also thy•rox•in


a hormone of the thyroid gland that regulates the metabolic rate of the body: preparations of it used for treating hypothyroidism.
[1915–20; thyr- + ox- + in (dol) e (orig. thought to be a chemical component)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


A hormone made in the thyroid that is important for growth and mental development.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.thyroxine - hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells; "thyroxine is 65% iodine"
thyroid hormone - any of several closely related compounds that are produced by the thyroid gland and are active metabolically
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


, thyroxin
n. tiroxina, hormona producida por la tiroides que contiene yodo; se obtiene sintéticamente de la tiroides de animales y se usa en el tratamiento de hipotiroidismo.
English-Spanish Medical Dictionary © Farlex 2012


n tiroxina
English-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.