men·stru·a·tion (m?n?stro?o-??sh?n)n. The monthly flow of blood and cellular debris from the uterus that begins at puberty in women and the females of certain other primates. In women, menstruation ceases at menopause. Also called catamenia, menses.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.menstruation (?m?nstr??e???n) n (Physiology) 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 menstruous adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014men?stru?a?tion (?m?n stru?e? ??n, -?stre?-) n. 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. [1770?80] men?stru?ous (-stru ?s, -str?s) adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.men·stru·a·tion (m?n?stro?o-??sh?n) The monthly flow of blood from the uterus that begins at puberty in girls and in the females of other primates. Also called menses.The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.menstruationThe monthly flow of blood and uterine lining from the vagina of nonpregnant females between menarche and menopause.Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited