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- DictionaryNep·tune/ˈnepˌto͞on/
- 1. a distant planet of the solar system, eighth in order from the sun, discovered in 1846.
- 2. the god of water and of the sea.
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Neptune is the eighth and farthest known planet from the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth and slightly more massive than fellow ice giant Uranus. Neptune is denser and physically smaller than Uranus because its greater mass causes more gravitational compression of its ... Wikipedia