1. [ noun ] (Roman mythology) god of the sea; counterpart of Greek Poseidon
Related terms: Roman_deity Roman_mythology
2. [ noun ] Last name, frequency rank in the U.S. is 22774
3. [ noun ] (astronomy) a giant planet with a ring of ice particles; the 8th planet from the sun
Related terms: Jovian_planet solar_system
Similar spelling:   neptunium