Neptunian

[ nep-too-nee-uhn, -tyoo- ]

/ nɛpˈtu ni ən, -ˈtyu- /

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See synonyms for Neptunian on Thesaurus.com

adjective

pertaining to Neptune or the sea.

pertaining to the planet Neptune.

(often lowercase)Geology. formed by the action of water.

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THINGAMABOB OR THINGUMMY: CAN YOU DISTINGUISH BETWEEN THE US AND UK TERMS IN THIS QUIZ?

Do you know the difference between everyday US and UK terminology? Test yourself with this quiz on words that differ across the Atlantic.

Question 1 of 7

In the UK, COTTON CANDY is more commonly known as…

candystring

candyfloss

candypuff

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Origin of Neptunian

First recorded in 1650–60; Neptune + -ian

OTHER WORDS FROM Neptunian

trans-Nep·tu·ni·an, adjective

Words nearby Neptunian

nepman, nepo baby, Nepos, nepotism, neptune, Neptunian, neptunium, neptunium series, neral, NERC, nerd

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.
Summary Narrative of an Exploratory Expedition to the Sources of the Mississippi River, in 1820|Henry Rowe Schoolcraft
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

Neptunian

/ (nɛpˈtjuːnɪən) /

adjective

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