Webster's English Dictionary

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panther

pan.ther \'pan(t)-th*r\ n or panthers also panther [ME pantere, fr. OF, fr. 
   L panthera, fr. Gk panthe-r] pl  1: LEOPARD : as  1a: a leopard of a 
   supposed exceptionally large fierce variety  1b: a leopard of the black 
   color phase  2: COUGAR  3: JAGUAR