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

 

menstruation

 noun
noun
BrE BrE//ˌmenstruˈeɪʃn//
 
; NAmE NAmE//ˌmenstruˈeɪʃn//
 
[uncountable](formal)
 
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the process or time of menstruating compare period
See the Oxford Advanced American Dictionary entry: menstruation