What does Neptune mean?

Definitions for Neptune
ˈnɛp tun, -tyunNep·tune

Here are all the possible meanings and translations of the word Neptune.

Princeton's WordNet

  1. Neptunenoun

    (Roman mythology) god of the sea; counterpart of Greek Poseidon

  2. Neptunenoun

    a giant planet with a ring of ice particles; the 8th planet from the sun is the most remote of the gas giants

    "the existence of Neptune was predicted from perturbations in the orbit of Uranus and it was then identified in 1846"


  1. Neptunenoun

    (Astron.) The remotest major planet of our solar system, discovered -- as a result of the computations of Leverrier, of Paris -- by Galle, of Berlin, September 23, 1846. It is classed as a gas giant, and has a radius of 22,716 km and an estimated mass of 1.027 x 1026 kg, with an average density of 2.27 g/cc. Its mean distance from the sun is about 5,000,000,000 km (3,106,856,000 miles), and its period of revolution is about 164.78 years.

    Etymology: [L. Neptunus.]


  1. Neptunenoun

    The god of the ocean and of earthquakes.

    Etymology: From Neptunus.

  2. Neptunenoun

    The eighth planet in our solar system, represented in astronomy and astrology by u2646.

    Etymology: From Neptunus.

Webster Dictionary

  1. Neptunenoun

    the son of Saturn and Ops, the god of the waters, especially of the sea. He is represented as bearing a trident for a scepter

    Etymology: [L. Neptunus.]

  2. Neptunenoun

    the remotest known planet of our system, discovered -- as a result of the computations of Leverrier, of Paris -- by Galle, of Berlin, September 23, 1846. Its mean distance from the sun is about 2,775,000,000 miles, and its period of revolution is about 164,78 years

    Etymology: [L. Neptunus.]


  1. Neptune

    Neptune is the eighth and farthest planet from the Sun in the Solar System. It is the fourth-largest planet by diameter and the third-largest by mass. Among the gaseous planets in the solar system, Neptune is the most dense. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 times the mass of Earth but not as dense. On average, Neptune orbits the Sun at a distance of 30.1 AU, approximately 30 times the Earth–Sun distance. Named for the Roman god of the sea, its astronomical symbol is ♆, a stylised version of the god Neptune's trident. Neptune was the first planet found by mathematical prediction rather than by empirical observation. Unexpected changes in the orbit of Uranus led Alexis Bouvard to deduce that its orbit was subject to gravitational perturbation by an unknown planet. Neptune was subsequently observed on 23 September 1846 by Johann Galle within a degree of the position predicted by Urbain Le Verrier, and its largest moon, Triton, was discovered shortly thereafter, though none of the planet's remaining 12 moons were located telescopically until the 20th century. Neptune has been visited by only one spacecraft, Voyager 2, which flew by the planet on 25 August 1989.

Chambers 20th Century Dictionary

  1. Neptune

    nep′tūn, n. (Rom. myth.) the god of the sea, identified with the Greek Poseidon, represented with a trident in his hand: (astron.) the outermost planet of the solar system, discovered in 1846.—adj. Neptū′nian, pertaining to the sea: (geol.) formed by water: applied to stratified rocks or to those due mainly to the agency of water, as opposed to Plutonic or Igneous.—n. Nep′tūnist, one who holds the Neptunian theory in geology—also adj. [L. Neptunus.]

The Nuttall Encyclopedia

  1. Neptune

    the chief marine deity of the Romans, and identified with the Poseidon of the Greeks, is represented with a trident in his hand as his sceptre.

  2. Neptune

    the remotest planet of the solar system at present known; it is twice as far distant from the sun as Uranus (q. v.) is, deemed before its discovery the remotest; its diameter is four times greater than that of the earth, and it takes 60,126 days to revolve round the sun, accompanied by a solitary satellite; it was discovered in 1846 by Adams (q. v.) and Leverrier (q. v.), who were guided to the spot where they found it from the effect of its neighbourhood on the movements of Uranus.

U.S. National Library of Medicine

  1. Neptune

    The eighth planet in order from the sun. It is one of the five outer planets of the solar system. Its two natural satellites are Nereid and Triton.

Dictionary of Nautical Terms

  1. neptune

    A superior planet, recently discovered; it is the most distant member of the solar system yet known, and was revealed by the effect which its attraction had produced upon the movements of Uranus; this was one of the most admirable solutions in modern mathematical science. Neptune, so far as is yet known, has no satellites.

Editors Contribution

  1. Neptune

    A planet in the solar system.

    Neptune is another known and seen planet.

    Submitted by MaryC on May 3, 2015  

Suggested Resources

  1. neptune

    The neptune symbol -- In this Symbols.com article you will learn about the meaning of the neptune symbol and its characteristic.


  1. Neptune

    (Nep′tune), god of the sea, was a son of Saturn and Cybele, and brother to Jupiter and Pluto. He quarreled with Jupiter because he did not consider that the dominion of the sea was equal to Jupiter’s empire of heaven and earth; and he was banished from the celestial regions, after having conspired with Pluto to dethrone Jupiter. Neptune was married to Amphitrite, daughter of Oceanus and Tethys, by whom he had a son named Triton. He was also father of Polyphemus (one of the Cyclopes), Phoreus, and Proteus. Neptune is represented as being seated in a shell chariot, drawn by dolphins or sea-horses, and surrounded by Tritons and sea-nymphs. He holds in his hand a trident, with which he rules the waves. Though a marine deity, he was reputed to have presided over horse-training and horse-races; but he is principally known as the god of the ocean; and the two functions of the god are portrayed in the sea horses with which his chariot is drawn, the fore-half of the animal being a horse, and the hind-half a dolphin. Ships were also under his protection, and whenever he appeared on the ocean there was a dead calm.

Who Was Who?

  1. Neptune

    Boss of the seas. Has charge of the Atlantic liners wireless, and the seasick. Ambition: A bridge from London to New York. Recreation: Storms. Address: Atlantic. Clubs: Yacht.

How to pronounce Neptune?

How to say Neptune in sign language?


  1. Chaldean Numerology

    The numerical value of Neptune in Chaldean Numerology is: 2

  2. Pythagorean Numerology

    The numerical value of Neptune in Pythagorean Numerology is: 5

Examples of Neptune in a Sentence

  1. Alex Teachey:

    It it turns out to be, as we've suspected, a massive Jupiter-like planet with a moon roughly the size of Neptune, it's very strange, and not like anything astronomers have expected to exist out there, and that might tell you there's really some strange stuff going on elsewhere, not at all like what we see in our neighborhood.

  2. Joanna Barstow:

    Gliese 1214 b is a type of planet we call a Super-Earth -- a bit bigger than Earth, a bit smaller than Neptune. It's not dense enough to be rocky so it's probably like a warm mini-Neptune. There's nothing like it in our solar system and we don't really know what to expect, on my wish list for the future is a telescope to study exoplanets like Gliese 1214 b in more detail. I want to know what's going on beneath that cloud layer !

  3. Thomas Fuller:

    Bacchus hath drowned more men than Neptune.

  4. Fabo Feng:

    GJ 433 d is the nearest, widest and coldest Neptune-like planet ever detected.

  5. Suzanne Dodd:

    We need to develop an orbiter for each of those planets, at Uranus, the five major moons are very different. They have unique geological history, so we need to understand how they were formed or captured. Uranus has a rotational pole that is tipped on its side more than the Earth, so we need an understanding of why that happened. At Neptune, there are a great amount of features in atmosphere similar to Jupiter and Saturn. And Neptune's moon Triton is of interest because of the methane geysers on it.

Images & Illustrations of Neptune

  1. NeptuneNeptuneNeptuneNeptuneNeptune

Popularity rank by frequency of use


Translations for Neptune

From our Multilingual Translation Dictionary

Get even more translations for Neptune »


Find a translation for the Neptune definition in other languages:

Select another language:

  • - Select -
  • 简体中文 (Chinese - Simplified)
  • 繁體中文 (Chinese - Traditional)
  • Español (Spanish)
  • Esperanto (Esperanto)
  • 日本語 (Japanese)
  • Português (Portuguese)
  • Deutsch (German)
  • العربية (Arabic)
  • Français (French)
  • Русский (Russian)
  • ಕನ್ನಡ (Kannada)
  • 한국어 (Korean)
  • עברית (Hebrew)
  • Gaeilge (Irish)
  • Українська (Ukrainian)
  • اردو (Urdu)
  • Magyar (Hungarian)
  • मानक हिन्दी (Hindi)
  • Indonesia (Indonesian)
  • Italiano (Italian)
  • தமிழ் (Tamil)
  • Türkçe (Turkish)
  • తెలుగు (Telugu)
  • ภาษาไทย (Thai)
  • Tiếng Việt (Vietnamese)
  • Čeština (Czech)
  • Polski (Polish)
  • Bahasa Indonesia (Indonesian)
  • Românește (Romanian)
  • Nederlands (Dutch)
  • Ελληνικά (Greek)
  • Latinum (Latin)
  • Svenska (Swedish)
  • Dansk (Danish)
  • Suomi (Finnish)
  • فارسی (Persian)
  • ייִדיש (Yiddish)
  • հայերեն (Armenian)
  • Norsk (Norwegian)
  • English (English)

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:

Discuss these Neptune definitions with the community:



    Use the citation below to add this definition to your bibliography:


    "Neptune." Definitions.net. STANDS4 LLC, 2021. Web. 20 Oct. 2021. <https://www.definitions.net/definition/Neptune>.

    Are we missing a good definition for Neptune? Don't keep it to yourself...

    Browse Definitions.net

    Free, no signup required:

    Add to Chrome

    Get instant definitions for any word that hits you anywhere on the web!

    Free, no signup required:

    Add to Firefox

    Get instant definitions for any word that hits you anywhere on the web!


    Are you a words master?

    applied to a fish depicted horizontally
    • A. ostensive
    • B. lank
    • C. askant
    • D. naiant

    Nearby & related entries:

    Alternative searches for Neptune: