IodothyrinI`o*do*thy"rin\, n. [Iodo- + thyro- + -in.] (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.
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