Medical Dictionary

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 MorganNature15 Jan. 1987

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