menarche
- n the first occurrence of menstruation in a woman
- While there are some indications that the awkwardness is starting to fade menarche, or a girl's first period, has been cropping up in movies (including last year's Towelhead .
- The average age of menarche, or first menstruation, had already fallen dramatically (from 17 to about 13) between the middle of the 19th century to the middle of the 20th--mostly .
- The average age of menarche, or first menstruation, had already fallen dramatically (from 17 to about 13) between the middle of the 19th century to the middle of the 20thmostly .