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 Webster]

2. (Anat.) Of or pertaining to the thyroid body, thyroid cartilage, or thyroid artery; thyroideal. [1913 Webster]

{Thyroid cartilage}. See under {Larynx}.

{Thyroid body}, or {Thyroid gland} (Anat.), an endocrine gland having two lobes, located in the floor of the mouth or the region of the larynx, which secretes two hormones ({thyroxine} and {triiodothyronine}) that regulate the rates of growth and metabloism. In man and most mammals it is a highly vascular organ, partly surrounding the base of the larynx and the upper part of the trachea. Cases of hypothyroidism, where the gland is insufficiently active, can be treated by administration of thyroxine or a combination of thyroxine and triiodothyronine.

{Thyroid dislocation} (Surg.), dislocation of the thigh bone into the thyroid foramen.

{Thyroid foramen}, the obturator foramen. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

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  • 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 — /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… …   Universalium

  • 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

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  • 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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