[men-stroo-uhl, -struhl]
of or pertaining to menstruation or to the menses.
Archaic. monthly.

1350–1400; Middle English menstruall < Latin mēnstruālis having monthly courses, equivalent to mēnstru(a) monthly courses (noun use of neuter plural of mēnstruus monthly; mēnstr- (see semester) + -uus adj. suffix, probably on the model of annuus annual) + -ālis -al1

intermenstrual, adjective
postmenstrual, adjective
premenstrual, adjective
premenstrually, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
menstrual (ˈmɛnstrʊəl)
of or relating to menstruation or the menses

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. menstruel, from L. menstrualis "monthly," especially "of or having monthly courses," from menstruus "of menstruation, monthly," from mensis "month" (see menses).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

menstrual men·stru·al (měn'strōō-əl) or men·stru·ous (-əs)
Of or relating to menstruation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Compare that to menstrual blood, which has yet to even become an umbilical
  cord, and thus possesses far less limitations.
Normal variation in the length of the follicular phase of the menstrual cycle:
  effect of chronological age.
There are a number of different medicines prescribed for menstrual disorders.
Absent menstruation means no menstrual flow, or period.
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