noun
Graafian follicle
Medical term for a mature ovarian follicle. Used in anatomy, reproductive biology, and clinical contexts.
超音波検査で成熟したグラーフ卵胞が確認された。
A mature Graafian follicle was confirmed on ultrasound.
卵胞 is the general term for an ovarian follicle at any stage, while グラーフ卵胞 specifically refers to the mature, pre-ovulatory stage.
Named after the Dutch anatomist Regnier de Graaf. The term is a direct loan from English 'Graafian follicle', adapted into Japanese as グラーフ卵胞.