[1] : The Collaborative International Dictionary of English v.0.48

hairball \hair"ball`\, hair ball \hair" ball`\h^ar"be^l`,
   n.
   a compact mass of hair that forms in the stomach of animals
   as a result of licking fur; as, the cat coughed up a hairball
   right on the new rug. wordnet sense 1 + 2
   wordnet 1.5

[2] : WordNet (r) 2.0

hair ball
     n : a compact mass of hair that forms in the alimentary canal
         especially in the stomach of animals as a result of
         licking fur syn: hairball, trichobezoar
see also:
hairball trichobezoar 

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