a ball of hair accumulated in the stomach or intestines of a cat or other animal as a result of the animal's licking its coat.

1705–15; hair + ball1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hairball (ˈhɛəˌbɔːl)
a compact mass of hair that forms in the stomach of cats, calves, etc, as a result of licking and swallowing the fur, and causes vomiting, coughing, bloat, weight loss, and depression

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hairball hair·ball (hâr'bôl')
A small mass of hair located in the stomach or intestine of an animal, such as a cat, resulting from an accumulation of small amounts of hair that are swallowed each time the animal licks its coat. Also called pilobezoar, trichobezoar.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Slang Dictionary

hairball definition

  1. n.
    and furball. an obnoxious person. : I wish that the guys I date didn't always turn out to be hairballs. , Shut up, you skanky furball!
  2. exclam.
    How awful! (Usually Hairball! An exclamation of disgust. From the name of the undigested mass of fur vomited by a cat.) : Hairball! I did it wrong again!
  3. n.
    a mess; something difficult or unpleasant. : My life has become a hairball. I can't go on.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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