Recurring once a month; monthly; gonethrough or completedin a month; specifically, in astronomy, making a complete cycle of changes in a month; pertaining to changes of position recurring monthly: as, the menstrual equation of the sun's placePertaining to the menses of females; menstruous; catamenial: as, the menstrual flux or flow.In botany, same as menstruous, 3.Pertaining to a menstruum.