menarche means the onset of menstruation; a girl's first period. Lexicurio rates it Rare gem — a strength score of 83 out of 100.
menarche is pronounced /mɛˈnɑː.ki/.
Etymology
First attested 1900, from German Menarche, formed from meno- + -arche.
noun
- 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.”