[医] 毛团, 毛粪石(胃肠内)

[ noun ]
a compact mass of hair that forms in the alimentary canal (especially in the stomach of animals as a result of licking fur)
<noun.object>

hairball \hair"ball`\, hair ball \hair" ball`\(h[^a]r"b[e^]l`),
n.
a compact mass of hair that forms in the stomach of animals
as a result of licking fur; as, the cat coughed up a hairball
right on the new rug. [WordNet sense 1 + 2]
[WordNet 1.5]