·adj Of or pertaining to a menstruum.
II. Menstrual ·adj Of or pertaining to the menses; as, menstrual discharges; the menstrual period.
III. Menstrual ·adj 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.