Definitions for "Mifepristone"
(or RU 486) is a commercial name for a progesterone receptor antagonist similar in structure to the natural hormone progesterone, which is used medically as a birth control drug. (More? Birth Control)
an abortion-inducing drug (trade name Mifepristone) 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
An abortifacient drug for terminating a pregnancy
Keywords:  agent, chemical
The chemical agent in RU-486.