Menstrous

Websters 1828 Dictionary
Menstruous MEN'STRUOUS, a. [L. menstruus, from mensis, a month.]
1. Having the monthly flow or discharge; as a female.
2. Pertaining to the monthly flow of females.

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Oxford English Reference Dictionary
menstruous
adj.
1 of or relating to the menses.
2 menstruating.
Etymology: ME f. OF menstrueus or LL menstruosus (as MENSTRUAL)