One of the mysteries of the English language finally explained.
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.’
- ‘He tested for thyrotrophin releasing hormone in 67 women with menorrhagia who had normal concentrations of thyroxine and thyroid stimulating hormone.’
- ‘Hormones that require amino acids for starting materials include thyroxine (the hormone produced by the thyroid gland), and auxin (a hormone produced by plants).’
- ‘The thyroid releases too much of the hormone thyroxine, which increases the person's basal metabolic rate.’
Early 20th century: from thyroid + ox- ‘oxygen’ + in from indole (because of an early misunderstanding of its chemical structure), altered by substitution of -ine.
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