hairball definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a rounded mass of hair that may form in the stomach or intestines of a cow, cat, or other animal that licks its coat
hairball definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A small mass of hair in the stomach or intestine of an animal, such as a cat, that is accumulated when the animal swallows hair while licking its coat.
hairball - Medical Definition
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.