Neptunian

Neptunian

[nep-too-nee-uhn, -tyoo-]
adjective
1.
pertaining to Neptune or the sea.
2.
pertaining to the planet Neptune.
3.
(often lowercase) Geology. formed by the action of water.

Origin:
1650–60; Neptune + -ian

trans-Neptunian, adjective
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World English Dictionary
Neptunian (nɛpˈtjuːnɪən)
 
adj
1.  of or relating to the Roman god Neptune or the sea
2.  of, occurring on, or relating to the planet Neptune
3.  geology (of sedimentary rock formations such as dykes) formed under water

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