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[men-stroo-ey-shuh n, -strey-] /ˌmɛn struˈeɪ ʃən, -ˈstreɪ-/
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.
the period of menstruating.
Origin of menstruation
First recorded in 1770-80; menstruate + -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for menstruation


the approximately monthly discharge of blood and cellular debris from the uterus by nonpregnant women from puberty to the menopause Also called menses Nontechnical name period
Derived Forms
menstruous (ˈmɛnstrʊəs) adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for menstruation

1680s, from Late Latin menstruare, from menstruus "monthly" (see menstrual) + -ation. Old English equivalent was monaðblot "month-blood." Middle English had menstrue (n.), late 14c., from Old French menstrue, from Latin menstruum.

Online Etymology Dictionary, © 2010 Douglas Harper
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menstruation in Medicine

menstruation men·stru·a·tion (měn'strōō-ā'shən)
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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menstruation in Science
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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menstruation in Culture
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 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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