noun

1. an adjective, noun, or phrase, often specif. a disparaging one, used to characterize some person or thing (Ex.: “egghead” for an intellectual)
2. a descriptive name or title (Ex.: Philip the Fair; America the Beautiful)

Etymology: L epitheton < Gr, lit., that which is added < epitithenai, to put on, add < epi-, on + tithenai, to put, do