from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The first menstrual period, usually occurring during puberty.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The onset of menstruation; the beginning of the menstrual period. A girl's first period.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the first occurrence of menstruation in a woman
men(o)- + Greek arkhē, beginning (from arkhein, to begin).(American Heritage® Dictionary of the English Language, Fourth Edition)
First attested 1900, from German Menarche (1895), formed from meno- ("menstruation") + Ancient Greek ἀρχή (arche, "beginning"). (Wiktionary)