Definition of roughage noun from the Oxford Advanced American Dictionary

     

    roughage

     noun
    noun
    NAmE//ˈrʌfɪdʒ//
     
    [uncountable]
     
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  1. 1the part of food that helps to keep a person healthy by keeping the bowels working and moving other food quickly through the body synonym fiber
  2. 2 Fruit and vegetables are important sources of roughage.
See the Oxford Advanced Learner's Dictionary entry: roughage