#menstrual_cycle__menstrualcycle  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"
  supertype:  cycle.periodic_event  a single complete execution of a periodically repeated phenomenon: "a year constitutes a cycle of the seasons"
  part:  fertile_period__fertileperiod__fertilephase  the time in the menstrual cycle when fertilization is most likely to be possible (7 days before to 7 days after ovulation)
  part:  menstrual_phase__menstrualphase  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)
  part:  secretory_phase__secretoryphase__luteal_phase  the second half of the menstrual cycle after ovulation; the corpus luteum secretes progesterone which prepares the endometrium for the implantation of an embryo; if fertilization does not occur then menstrual flow begins
  part:  safe_period  that time during a woman's menstrual cycle during which conception is least likely to occur (usually immediately before of after menstruation)

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