Webster's English Dictionary

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bezoar

be.zoar \'be--.zo-(*)r, -.zo.(*)r\ n [F be`zoard, fr. Sp bezoar, fr. Ar 
   ba-zahr, fr. Per pa]-d-zahr, fr. pa-d protecting (against) + zahr poison : 
   any of various concretions found chiefly in the alimentary organs of rum 
   inants and formerly believed to possess magical properties