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

 

flatus

 noun
noun
BrE BrE//ˈfleɪtəs//
 
; NAmE NAmE//ˈfleɪtəs//
 
[uncountable](medical)
 
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gas in the stomach or intestines Word Origin mid 17th cent.: from Latin, literally ‘blowing’, from flare ‘to blow’.
See the Oxford Advanced American Dictionary entry: flatus