Calumniator | Webster's Dictionary of the English Language

calumniator
călumnĭātor (kălumnĭātor; v. the foreg.), ōris, m. [calumnior]; mostly t. t., I a contriver of tri...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
calumniator
calumniātor ōris, m calumnior, a trickster, malicious prosecutor, false informer, perverter of law...

An Elementary Latin Dictionary