Etymology
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roughage (n.)

1883, "rough grass or weeds, refuse of crops suitable for bedding for animals," from rough (adj.) + -age. In nutritional science, the meaning "coarse, bulky food" is attested by 1927.

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Definitions of roughage

roughage (n.)
coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis;
Synonyms: fiber
From wordnet.princeton.edu