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Definition of Hairball

Hairball: A wad of swallowed hair. Hairballs sometimes cause blockage of the digestive system, especially at the exit of the stomach. Also called 'trichobezoar.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=8896
Last Editorial Review: 3/19/2012

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