any word or phrase applied to a person or thing to describe an actual or attributed quality: “Richard the Lion-Hearted” is an epithet of Richard I.
2.
a characterizing word or phrase firmly associated with a person or thing and often used in place of an actual name, title, or the like, as “man's best friend” for “dog.”
3.
a word, phrase, or expression used invectively as a term of abuse or contempt, to express hostility, etc.
Origin: 1570–80; < Latin epitheton epithet, adjective < Greek epítheton epithet, something added, equivalent to epi-epi- + the- (variant stem of tithénai to put) + -ton neuter verbid suffix
1579, "descriptive name for a person or thing," from L. from Gk. epitheton, adj. often used as n., from neut. of epithetos "attributed, added," from epitithenai "to add on," from epi- "in addition" + tithenai "to put," from PIE base *dhe- "to put, to do" (see factitious).