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From: Webster's Revised Unabridged Dictionary (1913)

 I·o·do·thy·rin n.   Physiol. Chem. A peculiar substance obtained from the thyroid gland, containing from nine to ten per cent of iodine.
 Note:It is a very stable compound, and is believed to be active principle in thyroid extracts and in the internal secretion of the thyroid gland. It was originally called thyroiodin.