menstruation Hear it!

menstruation definition

men·strua·tion (men′stro̵̅o̅ ā′s̸hən, men strā′s̸hən)

noun

the menses; menstrual flow or a menstrual period

Etymology: ML menstruatio

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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