1) Animal hair 2) Hair ball 3) Problem for a cat 4) Rabbit disease 5) Tangle 6) Trichobezoar 1) Trichobezoar 2) Tuft 
A hairball is a small collection of hair or fur formed in the stomach of animals 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. Hairballs are sometimes mistaken for other conditions of the stomach such as lymph...
a clump of ingested hair; in some instances, hairballs can cause intestinal blockage in ferrets. 
(hār´bawl) trichobezoar; a concretion of hair sometimes found in the stomach or intestines of humans or other animals.
Hairball: A wad of swallowed hair. Hairballs can sometimes be found to cause blockage of the digestive system, especially at the exit of the stomach. Interestingly, in the Far East culture, hairballs are felt to have medicinal properties! Also called a trichobezoar.
Hairball is American slang for an unpleasant, despicable person.
[n] - a compact mass of hair that forms in the alimentary canal (especially in the stomach of animals as a result of licking fur)