menstrual cycle
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 • Hypernyms: cycle, oscillation • Part Meronyms: fertile period, fertile phase, menstrual phase, secretory phase, luteal phase, safe period
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