GNU Collaborative International Dictionary of English

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Found one definition

1.       
   hairball, hair ball (hârˈbĕlˌ), 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”. [wns=1 + 2]
   
   [WordNet 1.5]