trichobezoar
  毛糞石; 毛團
  tricho·be·zoar /ˌtrɪkoˈbɪˌzo(ə)r, ˌzɔ(ə)r/ 名詞
  trichobezoar
       n : a compact mass of hair that forms in the alimentary canal
           (especially in the stomach of animals as a result of
           licking fur) [syn: hairball, hair ball]