Sentence:  There meet two rivals of Neptunian race, / Hoſtilities begin with fierce grimace: / In ſcorn, contempt, in oaths and <WSD>calumny</WSD>, / In virulence, and vile contumely, ... 
Meaning of the word marked with <WSD> tags:  Falsifications or misrepresentations intended to disparage or discredit another.