The Collaborative International Dictionary
Calumniator \Ca*lum`ni*a"tor\, n. [L.] One who calumniates.
Syn: Slanderer; defamer; libeler; traducer.
Douglas Harper's Etymology Dictionary
1690s, from Latin calumniator, agent noun from calumniari (see calumniate (v.)).
Wiktionary
n. A person who calumniates.
Usage examples of "calumniator".
Chavigni made my charmer sit at his right hand, and I was placed between my two calumniators.
The calumniator is not yet punished, and he may hope that he will not be.
I was not aware that you had married Fernand, my calumniator, and that my father had died of hunger!
Affecting a just indignation at Monsieur de Lamotte's conduct towards him, he presented a demand that the latter should be declared a calumniator, and should pay damages for the injury caused to his reputation.
It was Sylla46 that taught them that calumniators ought not to be punished.
Between him and his mother was the most perfect sympathy, for secretly the lady was herself a devout disciple of the late and great Myron Bayne, though with the tact so generally and justly admired in her sex (despite the hardy calumniators who insist that it is essentially the same thing as cunning) she had always taken care to conceal her weakness from all eyes but those of him who shared it.
At the same time she sent the bailiff Labadie to Riguepeu, to find out the names of those who were traducing her, and to say that she intended to prosecute her calumniators with the utmost rigour of the law.