1) Hair ball 2) Hairball 3) Tangle 1) Hairball 
A hair cast in the stomach or intestinal tract, common in cats. ... Synonym: hair ball, pilobezoar. ... Origin: tricho-+ bezoar ... (05 Mar 2000) ... 
(trik″o-be´zor) a bezoar composed of hair; hairball.
Trichobezoar: A wad of swallowed hair. Also called a hairball. Trichobezoars can sometimes be found to cause blockage of the digestive system, especially at the exit of the stomach. Interestingly, in the Far East culture, trichobezoars are felt to have medicinal properties!
trichobezoar 1. A compact mass of hair that forms in the alimentary canal (especially in the stomach of animals as a result of licking fur); cats are one example. 2. A concretion within the stomach or intestines formed of hairs; 'hairball' or 'hair ball'. A bezoar is a ball of swallowed foreign material (usually hair or fiber) that collects in th...