Webster's English Dictionary

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beast

beast \'be-st\ n [ME beste, fr. OF, fr. L bestia] 1a: an animal as 
   distinguished from a plant  1b: a lower animal as distinguished from man  
   1c: a 4-footed mammal as distinguished from man, lower vertebrates, and inv 
   ertebrates 1d: an animal under human control  2: a contemptible person