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Neptunian

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.06 sec.
Nep·tune  (nptn, -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 Neptnus.]
Nep·tuni·an (-tn-n, -ty-) adj.
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Neptune
the planet Neptune
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