가임기 여성의 자궁 내막이 주기적으로 탈락하여 혈액과 함께 몸 밖으로 배출되는 생리 현상.
The monthly process in which blood and tissue are discharged from the lining of the uterus in non-pregnant females of reproductive age.
예문:
"Regular menstruation is often considered a sign of good reproductive health in women."
"The onset of menstruation, known as menarche, typically occurs during puberty."
"Hormonal imbalances can lead to irregular menstruation or the complete absence of a period."