Hairball
MASS OF HAIR COUGHED UP, OFTEN BY CATS
Trichobezoar; Hair balls; Fur ball; Hairballs; Hair ball
A hairball is a small collection of hair or fur formed in the stomach of animals, and uncommonly in humans, that is occasionally vomited up when it becomes too big. Hairballs are primarily a tight elongated cylinder of packed fur, but may include bits of other elements such as swallowed food.