Definition of polyonym in English:

polyonym

noun

rare
  • Ancient Greek Philosophy. Each of a number of different words having the same meaning; a synonym.

Origin

Mid 19th century; earliest use found in Saturday Review. In sense 1 from ancient Greek πολυώνυμον synonym (recorded in Hellenistic and Byzantine Greek authors, in Peripatetic philosophy), use as noun of neuter of πολυώνυμος; compare -onym, also synonym.

Pronunciation

polyonym

/ˈpɒlɪənɪm/