roughage Syllabification: (rough·age)Pronunciation: /ˈrəfij/Translate roughage | into French | into German | into Italian | into Spanish Definition of roughage noun fibrous indigestible material in vegetable foodstuffs that aids the passage of food and waste products through the gut. Farming coarse, fibrous fodder. roughage in other Oxford dictionaries Definition of roughage in the British & World English dictionary