Mature ovarian follicle within which an oocyte attains full size and which ruptures during ovulation to release the ovum.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 761 (https://doi.org/10.1515/pac-2015-1202)