late 14c., "god of the sea," from Latin Neptunus, son of Saturn, brother of Jupiter, the Roman god of the sea (later identified with Greek Poseidon), probably from PIE root *nebh- "cloud" (source of Latin nebula "fog, mist, cloud;" see nebula), via a sense of "moist, wet." The planet so named was discovered by Galle in 1846. Until the identification of Pluto in 1930, it was the most distant planet known.
例文
1. Neptune is the furthest planet from the sun.
海王星は太陽から最も遠い惑星である。
2. Neptune turned out to be a dynamic,stormy world.
海王星はもともと活気があり、嵐の多い世界だった。
3.He managed to walk a little farther-but he never reached the Neptune .