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]