thyroxine

[ thahy-rok-seen, -sin ]

noun

1. Biochemistry. the thyroid gland hormone that regulates the metabolic rate of the body.
2. Pharmacology. a commercial form of this compound, obtained from the thyroid glands of animals or synthesized, used in the treatment of hypothyroidism. : T 4

thyroxine

/ θaɪˈrɒksɪn; θaɪˈrɒksiːn; -sɪn /

noun

1. 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: C 15 H 11 I 4 NO 4

thyroxine

/ thī-rŏk′sēn′,-sĭn /

1. An iodine-containing hormone secreted by the thyroid gland that increases the rate of cell metabolism and regulates growth. Thyroxine can also be made synthetically for treatment of hypothyroidism.

Word History and Origins

Origin of thyroxine¹

1915–20; thyr- ( def ) + ox- + in(dol)e (originally thought to be a chemical component)

Word History and Origins

Origin of thyroxine¹

C19: from thyro- + oxy- ² + -ine ²

Example Sentences

However, the OATP1C1 transporter protein used in the new study was found to be far more effective at transporting thyroxine derivatives than LAT1.

From Science Daily

The baby lacks thyroxine, a key growth hormone.

From BBC

The New York State Gaming Commission fined Asmussen $10,000 in November 2015 for administering the hormone thyroxine to horses at Saratoga within 48 hours of racing, a violation of state regulations.

From Seattle Times

Among the drugs named in Blea’s complaint was thyroxine, a thyroid hormone supplement whose use in horses has been controversial.

From Los Angeles Times

The more thyroxine a person’s thyroid gland produces, the higher that person’s basal metabolic rate will be.

From Washington Post