noun Physiology.

  1. the first menstrual period; the establishment of menstruation.


  1. the first occurrence of menstruation in a woman’s life

n.1896, from German menarche (1895), from Greek men (genitive menos) “month” (see moon (n.)) + arkhe “beginning” (see archon). n.

  1. The first menstrual period, usually during puberty.

  1. The first menstrual period.

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