Definition of thyroxine in English:

thyroxine

Line breaks: thy¦rox|ine
Pronunciation: /θʌɪˈrɒksiːn
 
, -sɪn/

noun

[mass 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
More 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.

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