Определение menstrual cycle в Английский Язык Английский Язык словарь
The recurring cycle of physiological changes in the females of some animal species that is associated with reproductive fertility; especially the cycle in a human woman
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; "the average menstrual cycle is 28 days