bran - food prepared from the husks of cereal grains

chaff, husk, shuck, stalk, stubble, straw - material consisting of seed coverings and small pieces of stem or leaves that have been separated from the seeds

roughage - coarse food high in fiber but low in nutrients; its bulk stimulates peristalsis

bran - broken husks of the seeds of cereal grains that are separated from the flour by sifting