Nep·tune (n p t n , -tyn)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 radius of 24,000 kilometers (15,000 miles), and a mass 17.2 times that of Earth. [Latin Nept  nus.]Nep·tu ni·an (-tn - n, -ty-) adj. |
Neptunian [nɛpˈtjuːnɪən]
adj
1. (Myth & Legend / Classical Myth & Legend) of or relating to the Roman god Neptune or the sea
2. (Astronomy) of, occurring on, or relating to the planet Neptune
3. (Earth Sciences / Geological Science) Geology (of sedimentary rock formations such as dykes) formed under water
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