Examples from the Web for roughage
It is on this roughage or waste material that intestinal movement or peristalsis depends.Health Through Will Power|James J. Walsh
The geese will eat a considerable amount of this which thus helps to supply the roughage which they need.
Some roughage such as vegetables or hay should also be supplied.
Alfalfa in every instance is intended as a roughage, as an appetizer and as a protein feed.Farm Mechanics|Herbert A. Shearer
Also they gave us roughage fur our hosses and wouldn't take pay fur none of it, indicatin' by signs that it was all a free gift.Those Times And These|Irvin S. Cobb