The Collaborative International Dictionary of English v.0.48:

Woof \Woof\ (w[=oo]f), n. [OE. oof, AS. [=o]wef, [=o]web,
   [=a]web; on, an, on + wef, web, fr. wefan to weave. The
   initial w is due to the influence of E. weave. See On,
   Weave, and cf. Abb.]
   [1913 Webster]
   1. The threads that cross the warp in a woven fabric; the
      weft; the filling; the thread usually carried by the
      shuttle in weaving.
      [1913 Webster]

   2. Texture; cloth; as, a pall of softest woof. --Pope.
      [1913 Webster]

WordNet (r) 3.0 (2006):

woof
    n 1: the yarn woven across the warp yarn in weaving [syn:
         woof, weft, filling, pick]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "woof":
   cloth, drapery, etoffe, fabric, feel, felt, filling, finish, goods,
   grain, granular texture, indentation, knub, lace, material, nap,
   napery, nub, pick, pile, pit, pock, protuberance, rag, shag, shoot,
   silk, structure, stuff, surface, surface texture, textile,
   textile fabric, texture, tissu, tissue, wale, warp, weave, web,
   weft, wool