Neptune is the eighth and farthest planet from the sun in the solar system. Among the giant planets in the Solar System, Neptune is the most dense. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus which is 15 times the mass of Earth and slightly larger than Neptune
1.the first meaning is:god of water and of the sea
2.the second meaning is a distant planet of the solar system, eighth in order from the sun, discovered in 1846.
Neptune (planet): Instamentary