menstrual cycle

/M EH1 N S T R UW0 AH0 L S AY1 K AH0 L/
noun
  1. 1

    The recurring cycle of physiological changes in the uninseminated females of some animal species that is associated with reproductive fertility; especially the cycle in a human woman.

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Source: https://en.wiktionary.org/wiki/menstrual%20cycle