menstrual phase

Noun
  1. The phase of the menstrual cycle during which the lining of the uterus is shed (the first day of menstrual flow is considered day 1 of the menstrual cycle) (synset 115313943)
    is a type of: phase, stage - any distinct time period in a sequence of events
    is a part of: 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

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