For the noun: bison
Plural form: bisons

WordReference Random House Learner's Dictionary of American English © 2017
bi•son /ˈbaɪsən, -zən/USA pronunciation   n.[countable]pl.  -son. 
  1. Mammalsa North American buffalo having a large head and high, humped shoulders.

WordReference Random House Unabridged Dictionary of American English © 2017
bi•son  (bīsən, -zən),USA pronunciation  n., pl.  -son. 
  1. MammalsAlso called  American bison, American buffalo. a North American, oxlike ruminant, Bison bison, having a large head and high, humped shoulders: formerly common in North America, its small remaining population in isolated western areas of the U.S. and Canada is now protected.
  2. MammalsAlso called  wisent. a related animal, Bison bonasus, of Europe, less shaggy and slightly larger than the American bison: now greatly reduced in number.
Cf.  buffalo.  bi•son•tine  (bīsən tīn′, -zən-),USA pronunciation adj. 
  • Gmc; compare Old High German wisunt, Old English wesend, Old Norse visundr
  • Latin (nominative singular bisōn)
  • 1350–1400; Middle English bisontes (plural)

Collins Concise English Dictionary © HarperCollins Publishers::

bison /ˈbaɪsən/ n ( pl -son)
  1. Also called: American bison, buffalo a member of the cattle tribe, Bison bison, formerly widely distributed over the prairies of W North America but now confined to reserves and parks, with a massive head, shaggy forequarters, and a humped back

  2. Also called: wisent, European bison a closely related and similar animal, Bison bonasus, formerly widespread in Europe
Etymology: 14th Century: from Latin bisōn, of Germanic origin; related to Old English wesand, Old Norse vīsundr

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