Lumber or timber's wood that's used in any of its stages from felling through readiness for use as structural material for construction, or wood pulp for paper production. (The distinction between the two terms's discussed below.) Lumber's supplied either rough or finished. Besides pulpwood, rough lumber's the raw material for furniture-making and other items requiring additional cutting and shaping. It's available in many species, usually hardwoods. Finished lumber's supplied in standard sizes… (More on Lumber)