Nĕpt'ūne, n.

(30), n. [Lat. Neptunus.]

1. (Rom. Myth.) The son of Saturn and Ops, the god of the sea, fountains, and rivers. He is represented as bearing a trident for a scepter.
2. (Astron.) A large planet beyond Uranus, discovered—as a result of the computations of Le Verrier, of Paris—by Galle, of Berlin, September 23, 1846. Its mean distance from the sun is about 2,850,000,000 miles, and its period of revolution is about 164.6 years.