menstruation
noun[U]
formaluk/ˌmen.struˈeɪ.ʃən/us/ˌmen.struˈeɪ.ʃən/theprocessofmenstruating:
theonsetof menstruation月经开始
Compare
thecurseold-fashionedorhumorous
mensesformal
periodnoun
Obstetrics: processes & stages connected with sexual reproduction
- amniotic
 - andropause
 - biological clock
 - come on
 - curse
 - dysmenorrhea
 - fetal
 - impregnate
 - menopause
 - non-cyclical
 - ova
 - perimenopausal
 - perimenopause
 - perinatal
 - PMS
 - post-conception
 - premenstrual
 - premenstrual syndrome
 - pubescent
 - someone'sbiological clock is tickingidiom