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
[Webster 1913 Suppl.]
It is probably an impure extract of thyroid gland, containing thyroxine. See Merck Index 11th Ed. #9345, the entry for thyroidin.
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