Pronunciation: (prō-jes'tu-rōn"),[key] —n. 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.