A steroid hormone, C21H30O2, secreted by the corpus luteum of the ovary and by the placenta, that acts to prepare the uterus for implantation of the fertilized ovum, to maintain pregnancy, and to promote development of the mammary glands.

• 黄体荷尔蒙，黄体酮类固醇荷尔蒙，化学式为C21H30O2，由卵巢的黄体和胎盘分泌，其活动准备子宫移植受精卵子，保持受孕，以及促进乳腺的增大