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The Collaborative International 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.

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

    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.

Douglas Harper's Etymology Dictionary
thyroxine

active principle of the thyroid gland, 1915, from thyro-, comb. form of thyroid, + oxy- (apparently a reference to the oxygen atom present in it, but OED has it as a shortening of oxy-indol) + chemical suffix -ine (2), denoting an amino acid.

Wiktionary
thyroxine

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

WordNet
thyroxine

n. hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells; "thyroxine is 65% iodine" [syn: thyroxin, tetraiodothyronine, T]

Usage examples of "thyroxine".

The most unusual point about the structure of the thyroxine molecule is the fact that it contains four iodine atoms, symbolized in the formula above by I.

For that reason, iodine makes up about 63 per cent of the weight of the thyroxine molecule.

The thyroxine molecules are then united with other, more common amino acids and stored as the large thyroglobulin molecule.

At need, the thyroxine content of the thyroglobulin is stripped off and sent out into the bloodstream.

For some thirty-five years after the discovery of thyroxine, it was considered the thyroid hormone.

Yet what is it that thyroxine, tri-iodothyronine, and possible related compounds do to bring about such changes?

As with the corticoids and with thyroxine, there is an interplay between the various sex hormones and the pituitary.

He was given injections of thyroxine and adrenalin--and changed rapidly into a pituitary giant.

The thyroxine molecules are then united with other, more common amino acids and stored as the large thyroglobulin molecule.

CONADOTROPHINS As with the corticoids and with thyroxine, there is an interplay between the various sex hormones and the pituitary.