A recurring cycle (beginning at menarche and ending at menopause) in which the endometrial lining of the uterus prepares for pregnancy; if pregnancy does not occur the lining is shed at menstruation
Sik menstriyèl se yon nan femèl imen, se sik mansyèl ki gen ladan pwodiksyon ovil, preparasyon matris la pou resevwa ze a epi eliminasyon ovil la si li pa fekonde.