menarcheal

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me·nar·che·al

, menarchial (me-nar'kē-ăl),
Pertaining to the menarche.

menarche

(men-ar'ke) [Gr. men, month, + arche, beginning]
The initial menstrual period, normally occurring between the 9th and 17th year. See: adrenarche; puberty
menarchalmenarchealmenarchial, adjective