thyroxine
/θʌɪˈrɒksiːn
/ /θʌɪˈrɒksɪn/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.
- 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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