1. An abortion-inducing drug (trade name RU_486) developed in France; when taken during the first five weeks of pregnancy it blocks the action of progesterone so that the uterus sloughs off the embryo
   - abortion pill, RU 486

Derived forms: mifepristones

Type of: aborticide, abortifacient, abortion-inducing drug

Encyclopedia: Mifepristone

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