noun
anovulatory menstruation; non-ovulatory menstruation
Medical term for menstrual bleeding without ovulation. Used in clinical contexts.
無排卵性月経は、思春期や更年期によく見られる。
Anovulatory menstruation is often seen during puberty and menopause.
Compound of 無 (mu, 'without') + 排卵 (hairan, 'ovulation') + 性 (sei, 'nature') + 月経 (gekkei, 'menstruation'). A modern medical term.