noun
a compact mass of hair that forms in the stomach of some animals, especially cats, as a result of licking their fur
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The veterinarian advised the cat owner to monitor the cat's diet to prevent hairball formation.
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My cat keeps coughing up hairballs, it's so gross!
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I swear my cat is a hairball factory, I find them all over the house.
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The project was a hairball of complexity, requiring careful untangling to move forward.