Standard Lemma guide

Neptunian

adj · noun · 12 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Received-Pronunciation: /nɛpˈtjuː.nɪ.ən/
  • Received-Pronunciation: Recorded audio is listed in the source snapshot.
  • General-American: /nɛpˈt(j)u.ni.ən/
  • General-American: /-ˈtʃuː-/

1

adj

Meaning 1

Of or pertaining to Neptune, the Roman god of fresh water and the sea, the counterpart of the Greek god Poseidon.

Definition source: English Wiktionary via Wiktextract

Usage: Roman, not-comparable

Topics: human-sciences, mysticism, mythology, philosophy, sciences

Examples

  • Near-synonym: Poseidonian

Meaning relationships

Synonyms: Poseidonian

Antonyms: none provided

2

adj

Meaning 2

Of or pertaining to water or the sea.

Definition source: English Wiktionary via Wiktextract

Usage: broadly, not-comparable, rare

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adj

Meaning 3

Formed by the action of water.

Definition source: English Wiktionary via Wiktextract

Usage: broadly, not-comparable

Topics: geography, geology, natural-sciences

Examples

  • neptunian dyke

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

adj

Meaning 4

Of, pertaining to, or supporting Neptunism (“a discredited theory that rocks were formed from the crystallisation of minerals in the early Earth's oceans”).

Definition source: English Wiktionary via Wiktextract

Usage: broadly, historical, not-comparable

Topics: geography, geology, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

adj

Meaning 5

Pertaining to the astrological influence of the planet Neptune.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: astrology, human-sciences, mysticism, philosophy, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

adj

Meaning 6

Of or pertaining to the planet Neptune.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: astronomy, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

adj

Meaning 7

Alternative letter-case form of Neptunian.

Definition source: English Wiktionary via Wiktextract

Usage: alt-of, not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

A sailor.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: Neptunist, jack, jacktar, lobscouser, mariner, matelot, Neptunian, sailor, salt, seafarer, seaman, shipman, squid, swab, swabby, tar, waterman

Antonyms: none provided

9

noun

Meaning 9

A proponent of Neptunism.

Definition source: English Wiktionary via Wiktextract

Usage: historical

Topics: geography, geology, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: Neptunist

Antonyms: Plutonian, Plutonist, volcanist, Vulcanist

10

noun

Meaning 10

A person under the astrological influence of the planet Neptune.

Definition source: English Wiktionary via Wiktextract

Topics: astrology, human-sciences, mysticism, philosophy, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

11

noun

Meaning 11

An (imaginary) inhabitant of the planet Neptune.

Definition source: English Wiktionary via Wiktextract

Topics: literature, media, publishing, science-fiction

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

12

noun

Meaning 12

Alternative letter-case form of Neptunian.

Definition source: English Wiktionary via Wiktextract

Usage: alt-of

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

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”).

From Neptune (“eighth planet in the solar system”) + -ian.

Across languages

Translations

35 source translations are retained for this English entry.

  • Catalan: neptunià — of or pertaining to the Roman god Neptune
  • Catalan: neptúnic — of or pertaining to the Roman god Neptune
  • French: neptunien — of or pertaining to the Roman god Neptune
  • Italian: nettunio — of or pertaining to the Roman god Neptune
  • Bulgarian: океански (okeanski) — of or pertaining to water or the sea
  • Bulgarian: морски (morski) — of or pertaining to water or the sea
  • French: neptunien — of or pertaining to water or the sea
  • Italian: nettunio — of or pertaining to water or the sea
  • Catalan: neptúnic — formed by the action of water
  • Italian: nettunico — formed by the action of water
  • French: neptunien — of, pertaining to, or supporting Neptunism
  • German: Neptunisch — of, pertaining to, or supporting Neptunism
  • Italian: nettuniano — of, pertaining to, or supporting Neptunism
  • Arabic: نِبْتُونِيّ (nibtūniyy) — of or pertaining to the planet Neptune
  • Basque: neptunoar — of or pertaining to the planet Neptune
  • Catalan: neptúnic — of or pertaining to the planet Neptune
  • Finnish: Neptunukseen liittyvä — of or pertaining to the planet Neptune
  • Finnish: neptunuslainen — of or pertaining to the planet Neptune
  • German: neptunisch — of or pertaining to the planet Neptune
  • Italian: nettunense — of or pertaining to the planet Neptune
  • Italian: nettuniano — of or pertaining to the planet Neptune
  • Portuguese: netuniano — of or pertaining to the planet Neptune
  • Spanish: neptuniano — of or pertaining to the planet Neptune
  • Welsh: Neifionaidd — of or pertaining to the planet Neptune
  • French: neptunien — proponent of Neptunism
  • French: neptunienne — proponent of Neptunism
  • German: Neptunier — proponent of Neptunism
  • German: Neptunist — proponent of Neptunism
  • Italian: nettunista — proponent of Neptunism
  • Arabic: نِبْتُونِيّ (nibtūniyy) — inhabitant of the planet Neptune
  • Chinese Mandarin: 海王星人 (hǎiwángxīngrén) — inhabitant of the planet Neptune
  • French: Neptunien — inhabitant of the planet Neptune
  • French: Neptunienne — inhabitant of the planet Neptune
  • Irish: Neiptiúnach — inhabitant of the planet Neptune
  • Japanese: 海王星人 (Kaiōsei-jin) — inhabitant of the planet Neptune