Meaning of MENSTRUAL CYCLE

WordNet Dictionary
	Definition:		[n]  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"
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	See Also:		cycle, fertile period, fertile phase, luteal phase, menstrual phase, oscillation, safe period, secretory phase
Medical Dictionary
	Definition:		The monthly cycle of hormonal changes from the beginning of one menstrual period to the beginning of the next.
Biology Dictionary
	Definition:		The reproductive cycle of female humans. The cycle is characterized by a monthly discharge of blood, mucus, and tissues from the uterus (called menstruation) and involves changes to the lining of the uterus (the endometrium) during the rest of the month including a few days of fertility after an ovum (egg) is released by an ovary.