Definition of thyroxine in English:

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thyroxine

Pronunciation: /THīˈräksən/
/THīˈräkˌsēn/
(also thyroxin /-sin/)

noun

Biochemistry
The main hormone produced by the thyroid gland, acting to increase metabolic rate and so regulating growth and development.
  • An iodine-containing amino acid; chemical formula: C15H11NO4I4.
Example sentences
  • The thyroid releases too much of the hormone thyroxine, which increases the person's basal metabolic rate.
  • Human beings require iodine for the production of the thyroid hormones, thyroxine and triiodothyronine.
  • When your thyroid gland produces too much of the hormone thyroxine, you develop hyperthyroidism.

Origin

Early 20th century: from thyroid + ox- 'oxygen' + in from indole (because of an early misunderstanding of its chemical structure), altered by substitution of -ine4.

For editors and proofreaders

Syllabification: thy·rox·ine

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