Word Type

Adjective

Noun

The word "neptunian" can be used as adjective and noun.

Word Relationships

Coordinate Terms

Jovian Lunar Martian Mercurian Plutonian Saturnian Solar Terran Uranian Venusian

Derived Terms

Neptunian planet Neptunicentric cis-Neptunian neptunate neptunian dike neptunian dyke neptunic neptunite neptunium trans-Neptunian transneptunian

Derived From

neptune

Context

astronomy geology physics science fiction

Related Terms

Neptune Neptune grass Neptunism Neptunist

Related Terms

greek inhabitant mythology neptune neptunium planet solar system water

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.