wood pulp

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Pulp made from wood, used especially to make paper.

from The Century Dictionary.

• noun Chemical pulp is produced by the chemical treatment of wood in the form of chips. It is almost wholly included under the heads of sulphite pulp, made with the aid of a solution of calcium acid-sulphite, and soda pulp, made with a solution of caustic soda. Mechanical pulp is produced by grinding wood to a sort of powder against a rapidly revolving surface of sandstone under a stream of water. Pulp so prepared has very little felting power, and is generally used with some addition of material of longer fiber. It is employed very largely in making lower-class, weak paper, such as that on which many newspapers are printed.
• noun Wood-fiber reduced to a pulp, either mechanically or chemically, for use in the manufacture of paper.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun pulp made from wood (most often softwood, but sometimes hardwood) that is used to make paper

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun wood that has been ground to a pulp; used in making cellulose products (as rayon or paper)