The Collaborative International Dictionary of English v.0.48:

Bezoar \Be"zoar\, n. [F. b['e]zoard, fr. Ar. b[=a]zahr,
   b[=a]dizahr, fr. Per. p[=a]d-zahr bezoar; p[=a]d protecting +
   zahr poison; cf. Pg. & Sp. bezoar.]
   A calculous concretion found in the intestines of certain
   ruminant animals (as the wild goat, the gazelle, and the
   Peruvian llama) formerly regarded as an unfailing antidote
   for poison, and a certain remedy for eruptive, pestilential,
   or putrid diseases. Hence: Any antidote or panacea.
   [1913 Webster]

   Note: Two kinds were particularly esteemed, the Bezoar
         orientale of India, and the Bezoar occidentale of Peru.
         [1913 Webster]

   Bezoar antelope. See Antelope.

   Bezoar goat (Zool.), the wild goat (Capra [ae]gagrus).

   Bezoar mineral, an old preparation of oxide of antimony.
      --Ure.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bezoar goat
    n 1: wild goat of Iran and adjacent regions [syn: bezoar goat,
         pasang, Capra aegagrus]