thyroxine

/thuy rok"seen, -sin/, n.
1. Biochem. the thyroid gland hormone that regulates the metabolic rate of the body.
2. Pharm. a commercial form of this compound, obtained from the thyroid glands of animals or synthesized, used in the treatment of hypothyroidism. Symbol.: T4
Also, thyroxin /thuy rok"sin/.
[1915-20; THYR- + OX- + IN(DOL)E (orig. thought to be a chemical component)]

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or l-tetraiodothyronine or T4

One of the two major hormones (along with the closely related l-triiodothyronine, or T3) secreted by the thyroid gland.

Its principal function is to stimulate oxygen consumption and thus metabolism in all cells and tissues in the body. Thyroxine is formed by the addition of iodine to the amino acid tyrosine while the latter is in a protein-bound form. Thyroxine secretion is excessive in hyperthyroidism and deficient in hypothyroidism.

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also called  3,5,3′,5′-tetraiodothyronine , or  T4 

      one of the two major hormones secreted by the thyroid gland (the other is triiodothyronine). Thyroxine's principal function is to stimulate the consumption of oxygen and thus the metabolism of all cells and tissues in the body. Thyroxine is formed by the molecular addition of iodine to the amino acid tyrosine while the latter is bound to the protein thyroglobulin. Excessive secretion of thyroxine in the body is known as hyperthyroidism, and the deficient secretion of it is called hypothyroidism.

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Universalium. 2010.

Look at other dictionaries:

  • Thyroxine — Thyroxine …   Wikipedia

  • thyroxine — [ tirɔksin ] n. f. • 1933; mot angl. (1915), de thyr(oïde) et rad. de oxyde ♦ Biochim. L une des principales hormones thyroïdiennes, libérée dans le sang par l hydrolyse de la thyroglobuline, et contenant de l iode. La thyroxine augmente le… …   Encyclopédie Universelle

  • Thyroxine — Général DCI thyroxine Nom IUPAC acide 2 …   Wikipédia en Français

  • thyroxine — (n.) from thyro , comb. form of THYROID (Cf. thyroid), + OXY (Cf. oxy ) + indole + chemical suffix INE (Cf. ine) (2). So called from the original description of its composition …   Etymology dictionary

  • thyroxine — [thī räks′inthī räk′sēn΄, thī räk′sin] n. [ THYR(O) + OX(Y) + INE3] a colorless, crystalline compound, C15H11I4NO4, the active hormone of the thyroid gland, often prepared synthetically and used in treating goiter, cretinism, and myxedema: also… …   English World dictionary

  • thyroxine — The l isomer is the active iodine compound existing normally in the thyroid gland and extracted therefrom in crystalline form for therapeutic use; also prepared synthetically; used for the relief of hypothyroidism, cretinism, and myxedema …   Medical dictionary

  • thyroxine — Thyroid Thy roid, a. [Gr. qyreoeidh s shield shaped; qyreo s a large, oblong shield (from qy ra a door) + e i^dos form: cf. F. thyro[ i]de, thyr[ e]o[ i]de.] 1. Shaped like an oblong shield; shield shaped; as, the thyroid cartilage. [1913… …   The Collaborative International Dictionary of English

  • thyroxine — A hormone that is made by the thyroid gland and contains iodine. Thyroxine increases the rate of chemical reactions in cells and helps control growth and development. Thyroxine can also be made in the laboratory and is used to treat thyroid… …   English dictionary of cancer terms

  • thyroxine — tetraiodothyronine; = T4; n. the principal hormone synthesized and secreted into the bloodstream by the thyroid gland (see thyroid hormone). Most of it is converted to a more metabolically active form, triiodothyronine, within the peripheral… …   The new mediacal dictionary

  • thyroxine — tiroksinas statusas T sritis chemija apibrėžtis Skydliaukės hormonas. formulė HO(I₂)C₆H₂OC₆H₂(I₂)CH₂CH(NH₂)COOH atitikmenys: angl. thyroxine; 3,5,3ˊ,5ˊ tetraiodothyronine rus. тироксин; 3,5,3ˊ,5ˊ тетраиодтиронин ryšiai: sinonimas – 3,5,3ˊ,5ˊ… …   Chemijos terminų aiškinamasis žodynas

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