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

1895–1900; men- + archḗ beginning

menarcheal, menarchial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
menarche (mɛˈnɑːkɪ)
the first occurrence of menstruation in a woman's life
[C20: New Latin, from Greek mēn month + arkhē beginning]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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)
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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