"catamenia" in the noun sense
1. menstruation, menses, menstruum, catamenia, period, flow
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
"the women were sickly and subject to excessive menstruation"
"a woman does not take the gout unless her menses be stopped"
Source: WordNet® (An amazing lexical database of English)
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