Men″stru‐al (?), a. [L. menstrualis: cf. F. menstruel. See Menstruous.] 1. Recurring once a month; monthly; gone through in a month; as, the menstrual revolution of the moon; pertaining to monthly changes; as, the menstrual equation of the sun's place.
2. Of or pertaining to the menses; as, menstrual discharges; the menstrual period.
3. Of or pertaining to a menstruum. Bacon.