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denidation (uncountable)

  1. the breakup and expulsion of the endometrium during menstruation
    • 1894, Walter Heape, The Menstruation of Semnopithecus entellus, in Philosophical Transactions of the Royal Society of London, Vol. 185
      Finally, he [sc. Aveling] believes that menstruation is probably determined by the act of “denidation,” as he calls it, because it is from the denided surface that the menstrual flow comes.