menstruation

[men-stroo-ey-shuhn, -strey-]
noun
1.
the periodic discharge of blood and mucosal tissue from the uterus, occurring approximately monthly from puberty to menopause in nonpregnant women and females of other primate species.
2.
the period of menstruating.

Origin:
1770–80; menstruate + -ion

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
menstruation (ˌmɛnstrʊˈeɪʃən)
 
n
Also called: menses, Nontechnical name: period the approximately monthly discharge of blood and cellular debris from the uterus by nonpregnant women from puberty to the menopause
 
menstruous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

menstruation
c.1780, from menstruate + -tion.; O.E. equivalent was monaðblot "month-blood."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

menstruation men·stru·a·tion (měn'strōō-ā'shən)
n.
The process or an instance of discharging the menses.

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
menstruation   (měn'str-ā'shən)  Pronunciation Key 
The monthly flow of blood from the uterus beginning at puberty in girls and other female primates. Also called menses. See also menstrual cycle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
menstruation [(men-strooh-ay-shuhn)]

The periodic discharge of the blood-enriched lining of the uterus through the vagina. Menstruation marks the end of one menstrual cycle and the beginning of another.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
As nutrition and living conditions improved, the age at first menstruation occurred two to three months earlier each decade.
Abdominal pain that occurs during menstruation may be from menstrual cramps or it may indicate a problem in a reproductive organ.
After menstruation starts, the ovaries begin to produce and release eggs, which have been stored in the ovaries since birth.
Sometimes, adjusting medications in anticipation of menstruation may help prevent attacks.
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