Pronunciation: (prō-jes'tu-rōn"), [key]
1. Biochem.a hormone, C21H30O2, that prepares the uterus for the fertilized ovum and maintains pregnancy.
2. Pharm.a commercial form of this compound, obtained from the corpus luteum of pregnant sows or synthesized: used in the treatment of dysfunctional uterine bleeding, dysmenorrhea, threatened or recurrent abortion, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.