antiprogestin

noun
an·​ti·​pro·​ges·​tin | \-prō-ˈjest-ən \

Medical Definition of antiprogestin 

: a substance (such as mifepristone) that inhibits the action of progesterone in the body RU-486 is an antiprogestin that is thought to compete with progesterone at the receptor site.— Charles Morgan, Nature, 15 Jan. 1987

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