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

 

roughage

 noun
noun
BrE BrE//ˈrʌfɪdʒ//
 
; NAmE NAmE//ˈrʌfɪdʒ//
 
[uncountable]
 
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the part of food that helps to keep a person healthy by keeping the bowels working and moving other food quickly through the body synonym fibre Fruit and vegetables are important sources of roughage.
See the Oxford Advanced American Dictionary entry: roughage