Source : Webster's Revised Unabridged Dictionary (1913)

Disputant \Dis"pu*tant\, a. [L. disputants, p. pr. of disputare:
   cf. F. disputant. See {Dispute}, v. i.]
   Disputing; engaged in controversy. --Milton.

Disputant \Dis"pu*tant\, n.
   One who disputes; one who argues ?? opposition to another;
   one appointed to dispute; a controvertist; a reasoner in
   opposition.

         A singularly eager, acute, and pertinacious disputant.
                                                  --Macaulay.

Source : WordNet®

disputant
     n : a person who disputes; who is good at or enjoys controversy
         [syn: {controversialist}, {eristic}]