- a person, real or imaginary, from whom something, as a tribe, nation, or place, takes or is said to take its name: Brut, the supposed grandson of Aeneas, is the eponym of the Britons.
- a word based on or derived from a person’s name.
- any ancient official whose name was used to designate his year of office.
- a name, esp a place name, derived from the name of a real or mythical person, as for example Constantinople from Constantine I
- the name of the person from which such a name is derivedin the Middle Ages, “Brutus” was thought to be the eponym of “Britain”
one whose name becomes that of a place, a people, an era, an institution, etc., 1846, from Greek eponymos “given as a name, giving one’s name to something,” from epi “upon” (see epi-) + onyma, Aeolic dialectal variant of onoma “name” (see name (n.)).
- A name of a drug, structure, or disease based on or derived from the name of a person.