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Neptunian

[nep-too-nee-uh n, -tyoo-] /nɛpˈtu ni ən, -ˈtyu-/
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
1650-1660
1650-60; Neptune + -ian
Related forms
trans-Neptunian, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for transneptunian

Neptunian

/nɛpˈtjuːnɪən/
adjective
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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