Etymology
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menarche (n.)

"first appearance of menstruation," 1896, from German menarche (1895), from Greek men (genitive menos) "month" (see moon (n.)) + arkhē "beginning" (verbal noun of arkhein "to be the first;" see archon).

updated on January 30, 2019

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Definitions of menarche from WordNet

menarche (n.)
the first occurrence of menstruation in a woman;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.