[ nep-too-nee-uhn, -tyoo- ]
/ nɛpˈtu ni ən, -ˈtyu- /
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pertaining to Neptune or the sea.
pertaining to the planet Neptune.
(often lowercase)Geology. formed by the action of water.
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OTHER WORDS FROM Neptuniantrans-Nep·tu·ni·an, adjective
Words nearby Neptunian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use Neptunian in a sentence
The densities jump up for the next to planets, a small hop to a Neptunian density and a big leap up to nearly Martian density.These 6 exoplanets somehow orbit their star in perfect rhythm|Charlie Wood|January 27, 2021|Popular-Science
Though the account is very interesting, I do not perceive its exact bearing on the Neptunian and Plutonian hypotheses.
In six Neptunian months a forest of graceful larches would spring up to a height of seventy or eighty feet.The Romance of Plant Life|G. F. Scott Elliot
But to admit the "Plutonic" origin of such widespread formations was practically to abandon the Neptunian hypothesis.A History of Science, Volume 3(of 5)|Henry Smith Williams
An instance of this tendency, drawn from physical science, is supplied in the Neptunian geology of Werter.The Essays of Arthur Schopenhauer; Religion, A Dialogue, Etc.|Arthur Schopenhauer
The Neptunian leader began to gesture again, and conveyed to Burl that they wanted to attack as soon as possible.The Secret of the Ninth Planet|Donald Allen Wollheim
British Dictionary definitions for Neptunian
/ (nɛpˈtjuːnɪən) /
of or relating to the Roman god Neptune or the sea
of, occurring on, or relating to the planet Neptune
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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012