parturifacient

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Inducing or facilitating childbirth.
2. n. A drug facilitating childbirth.

Century Dictionary and Cyclopedia

1. n. A medicine, as ergot, which excites uterine action, or facilitates parturition; an oxytocic.

Wiktionary

1. n. medicine A medicine tending to cause parturition, or to give relief in childbirth.

GNU Webster's 1913

1. n. (Med.) A medicine tending to cause parturition, or to give relief in childbearing.