Menarche

//ˈmɛˌnɑɹ.ki// noun

Definitions

Noun
  1. 1
    The onset of menstruation; a girl's first period.

    "How old is she? Nine? Ten? The menarche is not far off – a hint of a bosom, poor child."

  2. 2
    the first occurrence of menstruation in a woman wordnet

Etymology

First attested 1900, from German Menarche, formed from meno- + -arche.

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