Neptunian.
Of or pertaining to Neptune, the Roman god of fresh water and the sea, the counterpart of the Greek god Poseidon.
Meaning & usage
Of or pertaining to Neptune, the Roman god of fresh water and the sea, the counterpart of the Greek god Poseidon.
Of or pertaining to water or the sea.
Formed by the action of water.
neptunian dyke
Of, pertaining to, or supporting Neptunism (“a discredited theory that rocks were formed from the crystallisation of minerals in the early Earth's oceans”).
Where this word comes from
From Latin Neptūnius (“of or pertaining to the Roman god Neptune”), from Neptūnus (“the Roman god Neptune”) (possibly ultimately from Proto-Indo-European *nebʰ- (“to become damp, cloudy”)) + -ius (suffix forming adjectives from nouns); analysable as Neptune + -ian. The English word is cognate with French neptunien (“pertaining to the Roman god Neptune, pertaining to the sea, pertaining to Neptunism, Neptunian; proponent of Neptunism, Neptunist”), German Neptunier (“proponent of Neptunism, Neptunist”).
A sailor.
A proponent of Neptunism.
Where this word comes from
From Latin Neptūnius (“of or pertaining to the Roman god Neptune”), from Neptūnus (“the Roman god Neptune”) (possibly ultimately from Proto-Indo-European *nebʰ- (“to become damp, cloudy”)) + -ius (suffix forming adjectives from nouns); analysable as Neptune + -ian. The English word is cognate with French neptunien (“pertaining to the Roman god Neptune, pertaining to the sea, pertaining to Neptunism, Neptunian; proponent of Neptunism, Neptunist”), German Neptunier (“proponent of Neptunism, Neptunist”).
Pertaining to the astrological influence of the planet Neptune.
Of or pertaining to the planet Neptune.
Where this word comes from
From Neptune (“eighth planet in the solar system”) + -ian.
A person under the astrological influence of the planet Neptune.
An (imaginary) inhabitant of the planet Neptune.
Where this word comes from
From Neptune (“eighth planet in the solar system”) + -ian.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.