'Refuter' definitions:

Definition of 'refuter'

From: WordNet
noun
A debater who refutes or disproves by offering contrary evidence or argument [syn: rebutter, disprover, refuter, confuter]

Definition of 'Refuter'

From: GCIDE
  • Refuter \Re*fut"er\ (r[-e]*f[=u]t"[~e]r), n. One who, or that which, refutes. [1913 Webster]