Source : Webster's Revised Unabridged Dictionary (1913)

Virtuoso \Vir`tu*o"so\, n.; pl. {Virtuosos}; It. {Virtuosi}.
   [It. See {Virtuous}.]
   1. One devoted to virtu; one skilled in the fine arts, in
      antiquities, and the like; a collector or ardent admirer
      of curiosities, etc.

            Virtuoso the Italians call a man who loves the noble
            arts, and is a critic in them.        --Dryden.

   2. (Mus.) A performer on some instrument, as the violin or
      the piano, who excels in the technical part of his art; a
      brilliant concert player.

Source : WordNet®

virtuoso
     adj : having or revealing supreme mastery or skill; "a consummate
           artist"; "consummate skill"; "a masterful speaker";
           "masterful technique"; "a masterly performance of the
           sonata"; "a virtuoso performance" [syn: {consummate}, {masterful},
            {masterly}, {virtuoso(a)}]
     n 1: someone who is dazzlingly skilled in any field [syn: {ace},
          {adept}, {champion}, {sensation}, {maven}, {mavin}, {genius},
           {hotshot}, {star}, {superstar}, {whiz}, {whizz}, {wizard},
           {wiz}]
     2: a musician who is a consummate master of technique and
        artistry
     [also: {virtuosi} (pl)]