antiprogestin
noun
an·ti·pro·ges·tin
-prō-ˈjest-ən 
variants
also anti-progestin
or antiprogestogen
or anti-progestogen
: 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
Charles Morgan, NatureCite this Entry
“Antiprogestin.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/antiprogestin. Accessed 3 Nov. 2025.
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