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Noun
abortion pill
mifepristone
RU 486
Definition: 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
Definition: A steroid pharmaceutical (trademark RU-486) that inhibits the action of progesterone given orally in early pregnancy to induce abortion, or as an emergency contraceptive.