n. The periodic discharging of the menses, the flow of blood and cells from the lining of the uterus in females of humans and other primates.
the GNU version of the Collaborative International Dictionary of English
n. The discharge of the menses; also, the state or the period of menstruating.
The Century Dictionary and Cyclopedia
n. The act of menstruating or discharging the menses.
n. The period of menstruating.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
Word Usage
"I'm quite certain the rangers of the National Parks Service while giving their tours of the National Mall do not, at any time, say the word "menstruation.""