thīˈrä.trə]fə̇n, ˌthīrə.ˈtrō] noun
or thy·rot·ro·pin ]pə̇n\
( -s )
Etymology: thyrotroph ic, thyrotrop ic + -in
: a hormone secreted by the anterior lobe of the pituitary body that regulates the formation and secretion of thyroid hormone and is used chiefly in the treatment of hypothyroidism due to pituitary deficiency