menstrual_cycle.n.01

'menstrual_cycle.n.01'

[menstrual_cycle.n.01] as in: 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

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Examples:
the average menstrual cycle is 28 days