Source : Webster's Revised Unabridged Dictionary (1913)

Rebut \Re*but"\, v. t. [imp. & p. p. {Rebutted}; p. pr. & vb. n.
   {Rebutting}.] [OF. reb??ter to repulse, drive back; pref. re-
   + bouter to push, thrust. See 1st {Butt}, {Boutade}.]
   1. To drive or beat back; to repulse.

            Who him, recount'ring fierce, as hawk in flight,
            Perforce rebutted back.               --Spenser.

   2. (Law) To contradict, meet, or oppose by argument, plea, or
      countervailing proof. --Abbott.

Source : WordNet®

rebut
     v 1: overthrow by argument, evidence, or proof; "The speaker
          refuted his opponent's arguments" [syn: {refute}]
     2: prove to be false or incorrect [syn: {refute}, {controvert}]
     [also: {rebutting}, {rebutted}]

rebutted
     See {rebut}