Akademik

roughage
Anything in the diet, e.g., bran, serving as a bulk stimulant of intestinal peristalsis.

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rough·age 'rəf-ij n FIBER (2) also food (as bran) containing much indigestible material acting as fiber

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n.
see dietary fibre

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rough·age (rufґəj) indigestible material such as fibers, cellulose, etc., in the diet.

Medical dictionary. 2011.