Yellow endocrine tissue that forms in a ruptured Graafian follicle following the release of an ovum; it degenerates after a few days unless pregnancy has begun WordNet 3.0 & Open English WordNet

The corpus luteum is a temporary endocrine structure in female ovaries involved in the production of relatively high levels of progesterone, and moderate levels of estradiol, and inhibin A. It is the remains of the ovarian follicle that has released a mature ovum during a previous ovulation. Wikipedia

A temporary endocrine structure in mammals Wikipedia Disambiguation

Temporary endocrine structure in ovaries producing progesterone, estradiol and inhibin A; the remains of an ovarian follicle that has released an egg Wikidata

A yellow mass of cells that forms from an ovarian follicle during the luteal phase of the menstrual cycle in mammals; it secretes steroid hormones. Wiktionary

Yellow mass of cells that forms from an ovarian follicle. Wiktionary (translation)