Definition of menses noun from the Oxford Advanced Learner's Dictionary

 

menses

 noun
noun
BrE BrE//ˈmensiːz//
 
; NAmE NAmE//ˈmensiːz//
 
(also the menses)[plural](specialist)
 
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the flow of blood each month from a woman’s body Word Origin late 16th cent.: from Latin, plural of mensis ‘month’.
See the Oxford Advanced American Dictionary entry: menses