menstruation definition | Dictionary.com

men⋅stru⋅a⋅tion

[men-stroo-ey-shuh

n, -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 (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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American Heritage Dictionary - Cite This Source - Share This

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

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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WordNet - Cite This Source - Share This

menstruation
noun
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause; "the women were sickly and subject to excessive menstruation"; "a woman does not take the gout unless her menses be stopped"--Hippocrates; "the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"--Aristotle

WordNet® 3.0, © 2006 by Princeton University.
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The American Heritage Science Dictionary - Cite This Source - Share This

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 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
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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American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

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

Merriam-Webster's Medical Dictionary - Cite This Source - Share This
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

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Menstruation

Men`stru*a"tion\, n. The discharge of the menses; also, the state or the period of menstruating.