Definition of menstrual adjective from the Oxford Advanced Learner's Dictionary

 

menstrual

 adjective
adjective
BrE BrE//ˈmenstruəl//
 
; NAmE NAmE//ˈmenstruəl//
 
 
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connected with the time when a woman menstruates each month The average length of a woman's menstrual cycle is 28 days. menstrual blood (formal) a menstrual period compare premenstrual Word Origin late Middle English: from Latin menstrualis, from menstruum ‘menses’, from mensis ‘month’.
See the Oxford Advanced American Dictionary entry: menstrual