The Collaborative International Dictionary of English v.0.48:

Cellulose \Cel"lu*lose`\, n. (Chem.)
   The substance which constitutes the essential part of the
   solid framework of plants, of ordinary wood, cotton, linen,
   paper, etc. It is also found to a slight extent in certain
   animals, as the tunicates. It is a carbohydrate,
   (C6H10O5)n, isomeric with starch, and is convertible into
   starches and sugars by the action of heat and acids. When
   pure, it is a white amorphous mass. See Starch,
   Granulose, Lignin.
   [1913 Webster]

         Unsized, well bleached linen paper is merely pure
         cellulose.                               --Goodale.
   [1913 Webster]

   Starch cellulose, the delicate framework which remains when
      the soluble part (granulose) of starch is removed by
      saliva or pepsin. --Goodale.
      [1913 Webster]