thyroxine noun. [Ɵʌɪ'rɒksi:n] Also (now rare) thyroxin [-ɪn]. E20.
[from THYRO- + OXY- + INDOLE (from a misunderstanding of its chemical structure), alt. after -INE⁵.]
Biochemistry. The chief hormone secreted by the thyroid gland, which increases the metabolic rate and regulates growth and development in animals; tetraiodothyronine, C₁₅H₁₁NO₄I₄.

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