-onymiccomb. form
Primary stress is attracted to the second syllable of this combining form and vowels may be reduced accordingly; see e.g.
demonymic n.Origin: Of multiple origins. Partly a borrowing from Greek. Partly formed within English, by derivation. Etymons: Greek -ωνυμικός ; -onym comb. form, -ic suffix.
Etymology: Partly < Hellenistic Greek -ωνυμικός (in e.g πατρωνυμικός patronymic adj.) < ancient Greek (Doric and Aeolic) ὄνυμα name (see -onym comb. form) + -ικός -ic suffix; partly < -onym comb. form + -ic suffix.Combined with first elements of both Greek and Latin origin. Earliest attested in the early 17th cent. in patronymic n. and adj., then in the late 18th cent. in matronymic n. and adj. and metonymic adj., and in a number of 19th and 20th-cent. formations.
This is a new entry (OED Third Edition, June 2004; most recently modified version published online September 2019).