Webster's English Dictionary

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bison

bi.son \'bi-s-*n, 'bi-z-\ \-*n-.ti-n\ n or bison [L bisont-, bison, of Gmc 
   origin; akin to OHG wisant aurochs;] pl  akin to OPruss wissambrs aurochs : 
   any of several large shaggy-maned usu. gregarious recent or extinct bovi ne 
   mammals (genus Bison) having a large head with short horns and heavy 
   forequarters surmounted by a large fleshy hump : as : WISENT  : BUFFALO  - 
   bi.son.tine aj