iodothyrin

CIDE DICTIONARY

iodothyrin, n. [Iodo- + thyro- + -in.].

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