CELLULOSE • DICTIONARY ONE.COM • Definition of Cellulose

... hereafter, combats the opinion that the bran is an alimentary substance. He observes that "the difficulty of keeping the bran in flour intended for the manufacture of bread of good quality appears to result much less from the presence of the cellulose (one of the constituents of woody matter) contained in wheat than that of the fatty matter. This is found in the bran in a quantity at least triple of that which remains in the flour, and the bolting separates it from the ground wheat not less usefully ...

— The Commercial Products of the Vegetable Kingdom • P. L. Simmonds