menarche

[muh-nahr-kee, me-]
noun Physiology.
the first menstrual period; the establishment of menstruation.

Origin:
1895–1900; men- + archḗ beginning

menarcheal, menarchial, adjective
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World English Dictionary
menarche (mɛˈnɑːkɪ)
 
n
the first occurrence of menstruation in a woman's life
 
[C20: New Latin, from Greek mēn month + arkhē beginning]
 
men'archeal
 
adj
 
men'archial
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

menarche
1900, from Ger. menarche (1895), from Gk. men (gen. menos) "month" + arkhe "beginning" (see archon).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

menarche me·nar·che (mə-när'kē)
n.
The first menstrual period, usually during puberty.


me·nar'che·al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
menarche   (mə-när'kē)  Pronunciation Key 
The first menstrual period.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
By the beginning of this century, however, the age of menarche was declining and the period of formal schooling was lengthening.
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