Source : Webster's Revised Unabridged Dictionary (1913)

Boson \Bo"son\ (b[=o]"s'n), n.
   See {Boatswain}. [Obs.] --Dryden.

Source : WordNet®

boson
     n : any particle that obeys Bose-Einstein statistics but not the
         Pauli exclusion principle; all nuclei with an even mass
         number are bosons