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countable and uncountable, plural menstruations
The periodic discharging of the menses, the flow of blood and cells from the lining of the uterus in unfertilized females of humans and other primates. quotations examples
It would seem that in Avebury, Stonehenge, and Malta the mystery cult of menstruation/mensuration reached its most consummate development.
1981, William Irwin Thompson, The Time Falling Bodies Take to Light: Mythology, Sexuality and the Origins of Culture, London: Rider/Hutchinson & Co., page 267
An instance of menstruation, the part of each month during which a fertile woman menstruates. examples