I`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.
⇒ 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.
© Webster 1913