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Definition of Antiprogestin
1. Noun. (biochemistry) Any substance that prevents cells from making or using progesterone. ¹
¹ Source: wiktionary.com
Medical Definition of Antiprogestin
1. A substance that inhibits progesterone formation, that interferes with its carriage or stability in the blood, or that reduces its uptake by, or effects on, target organs (e.g., RU-486). (05 Mar 2000)