What is "abortion pill"

n. A drug, such as mifepristone (Mifegyne), used to terminate a pregnancy in its earliest stage.

n. 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 [syn: RU 486, Mifepristone]