Wordnet 3.0
NOUN (1)
1.
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;
- Example: "the average menstrual cycle is 28 days"
WordNet (r) 3.0 (2006):
menstrual cycle
n 1: 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"