Etymology
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hairball (n.)

1712, from hair + ball (n.1).

updated on August 07, 2012

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Definitions of hairball from WordNet

hairball (n.)
a compact mass of hair that forms in the alimentary canal (especially in the stomach of animals as a result of licking fur);
Synonyms: hair ball / trichobezoar
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.