mature ovarian follicle

ma·ture o·var·i·an fol·li·cle

a follicle ready for ovulation; in the human ovary, its antrum attains a diameter of 6-8 mm and presents a surface bulge, the follicular stigma; a first maturation (meiotic) division of the primary oocyte usually occurs just prior to rupture of the follicle.
References in periodicals archive ?
These hormones allow the development of a single mature ovarian follicle from which a fertilizable egg can be released during each menstrual cycle.