Source : Webster's Revised Unabridged Dictionary (1913)

Bison \Bi"son\ (b[imac]"s[o^]n; 277), n. [L. bison, Gr. bi`swn,
   a wild ox; akin to OHG. wisunt, wisant, G. wisent, AS.
   wesend, Icel. v[=i]sundr: cf. F. bison.] (Zo["o]l.)
   (a) The aurochs or European bison.
   (b) The American bison buffalo ({Bison Americanus}), a large,
       gregarious bovine quadruped with shaggy mane and short
       black horns, which formerly roamed in herds over most of
       the temperate portion of North America, but is now
       restricted to very limited districts in the region of the
       Rocky Mountains, and is rapidly decreasing in numbers.

Source : WordNet®

bison
     n : any of several large shaggy-maned humped bovids having large
         heads and short horns

Source : Free On-Line Dictionary of Computing

Bison
     
         {GNU}'s replacement for the {yacc} {parser generator}.
        Bison runs under {Unix} and on {Atari} computers.  It was
        written by Robert Corbett.
     
        Latest version: 1.28, as of 2000-05-22.
     
        As of version 1.24, Bison will no longer apply the {GNU}
        {General Public License} to your code.  You can use the output
        files without restriction.
     
        {FTP GNU.org (ftp://ftp.gnu.org/gnu/bison/)} or your nearest
        {GNU archive site}.
     
        E-mail: .
     
        {Bison++} is a version which produces {C++} output.
     
        (2000-07-05)

Bison++
     
        GNU's Yacc parser generator retargeted to C++ by Alain
        Coetmeur .  Version 1.04.
     
        {(ftp://iecc.com/pub/file/bison++.tar.gz)}.
        {(ftp://iecc.com/pub/file/misc++.tar.gz)}.
        {(ftp://psuvax1.cs.psu.edu/pub/src/gnu/bison++-1.04.tar.Z)}.
     
        (1993-07-08)