refragator

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

rē̆frāgātor, ōris, m. [refragor],

an opponent , adversary : Ciceronis, Ascon. ad Or. in Tog. Cand. (p. 83 Orell.); Tert. adv. Gnost. 1.