Scrabble Dictionary

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Yes, thyroxine is playable

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Found in the following dictionaries

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OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Thyroxine" Definition

noun

An iodine-containing hormone, C15H11I4NO4, produced by the thyroid gland, that increases the rate of cell metabolism and regulates growth and that is made synthetically for treatment of thyroid disorders.
An iodine-containing hormone CHINO that is an amino acid produced by the gland as a product of the cleavage of , increases metabolic rate, and is used to treat thyroid disorders.

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