Abortifacient v. : Producing miscarriage.

Abortifacient n. : A drug or an agent that causes premature delivery.

Example:
Are all types of The Pill Abortifacient?

Taxonomy
abortifacients, Abortion, implantation, trade name, abortifacient herbs, plants, substances, mifepristone, Misoprostol, free encyclopedia, abortion pill, RU-486, Contraception, 2007-07-08, controversy, blastocyst, conjunction, herbal mixtures.

Defination from the web:
... counter" today are claimed by herbalists to act as abortifacients if taken in certain doses or mixtures. ... The ancient Greek colony of Cyrene at one time had an economy based almost entirely on the production and export of silphium, a powerful abortifacient in the parsley family. ...