roughage

[ruhf-ij]
noun
1.
rough or coarse material.
2.
any coarse, rough food for livestock.
3.
fiber ( def 9 ).

Origin:
1880–85; rough + -age

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
roughage (ˈrʌfɪdʒ)
 
n
1.  See also dietary fibre the coarse indigestible constituents of food or fodder, which provide bulk to the diet and promote normal bowel function
2.  any rough or coarse material

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

roughage
1883, "rough grass or weeds," from rough. Meaning "coarse, bulky food" first recorded 1927.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

roughage rough·age (rŭf'ĭj)
n.
See fiber.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Beans, wholegrain cereals such as oats and many fruit and vegetables are high
  in soluble fibre or roughage.
It is of such uncomplicated roughage that movie second features are made.
But a so-called salad of warm sauteed leeks, endive and watercress is more
  roughage than anyone needs.
All the roughage you will be eating can fill you up quickly and the concern is
  that you won't be getting enough calories or fat.
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