The Collaborative International Dictionary of English v.0.48:

Sorb \Sorb\, n.[L. sorbus the tree, sorbum the fruit; cf. F.
   sorbe. See Service tree.] (Bot.)
   (a) The wild service tree (Pyrus torminalis) of Europe;
       also, the rowan tree.
   (b) The fruit of these trees.
       [1913 Webster]

   Sorb apple, the fruit of the sorb, or wild service tree.

   Sorb tree, the wild service tree.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sorb
    n 1: acid gritty-textured fruit [syn: sorb, sorb apple]
    v 1: take up a liquid or a gas either by adsorption or by
         absorption [syn: sorb, take up]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "sorb":
   absorb, adsorb, assimilate, blot, blot up, chemisorb, chemosorb,
   digest, drink, drink in, drink up, engross, filter in, imbibe,
   infiltrate, osmose, percolate in, seep in, slurp up, soak in,
   soak up, sponge, swill up, take in, take up