Etymology
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menstrual (adj.)

late 14c., "pertaining to menses of females," from Old French menstruel and directly from Latin menstrualis "monthly," especially "of or having monthly courses," from menstruus "of a month, every month, monthly, pertaining to a month," from mensis "month" (see moon (n.)). Occasionally, in astronomy, "monthly" (1590s).

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Definitions of menstrual

menstrual (adj.)
of or relating to menstruation or the menses;
menstrual period
Synonyms: catamenial
From wordnet.princeton.edu