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menstruation

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men⋅stru⋅a⋅tion

[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. 2009.
Cite This Source Link To menstruation
men·stru·a·tion   (měn'strōō-ā'shən)   
n.  The process or an instance of discharging the menses.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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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Medical Dictionary

Main Entry: men·stru·a·tion
Pronunciation: "men(t)-str&-'wA-sh&n, men-'strA-
Function: noun
: a discharging of blood,secretions, and tissue debris from the uterus that recurs in nonpregnant human and other primate females of breeding age at approximately monthly intervals and that is considered to represent areadjustment of the uterus to the nonpregnant state following proliferative changes accompanying the preceding ovulation; also : PERIOD 1b
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

menstruation men·stru·a·tion (měn'str&oomacr;-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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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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