metyrapone
noun
me·tyr·a·pone
| \ mə-ˈtir-ə-ˌpōn also -ˈtīr-\
Medical Definition of metyrapone
: a metabolic hormone C14H14N2O that inhibits biosynthesis of cortisol and corticosterone and is used to test for normal functioning of the pituitary gland — see metopirone