roughage

(rufij)

noun

rough material; coarse substance; specif., coarse food or fodder, as bran, straw, vegetable peel, etc., containing a relatively high proportion of cellulose and other indigestible constituents and serving in the diet as a stimulus to peristalsis

See roughage in American Heritage Dictionary 4

noun
  1. See fiber.
  2. Any rough or coarse material.

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