Neptunian

enUK

Nep·tune

N0062900 (nĕp′to͞on′, -tyo͞on′)n.1. a. Roman Mythology The god of water, later identified with the Greek Poseidon.b. The sea.2. The eighth planet from the sun, having a sidereal period of revolution around the sun of 164.8 years at a mean distance of 4.5 billion kilometers (2.8 billion miles), a mean equatorial diameter of 49,528 kilometers (30,775 miles), and a mass 17.25 times that of Earth.
[Latin Neptūnus.]
Nep·tu′ni·an (-to͞o′nē-ən, -tyo͞o′-) adj.

Neptunian

(nɛpˈtjuːnɪən) adj1. (Classical Myth & Legend) of or relating to the Roman god Neptune or the sea2. (Geological Science) geology (of sedimentary rock formations such as dykes) formed under water

Neptunian

(nɛpˈtjuːnɪən) adj (Astronomy) of, occurring on, or relating to the planet Neptune