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dietary fibre

noun
  1. fibrous substances in fruits and vegetables, such as the structural polymers of cell walls, consumption of which aids digestion and is believed to help prevent certain diseasesAlso called: roughage
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012