mini-Neptune

noun

A planet less massive than Neptune but resembling Neptune in that it has a thick hydrogen-helium atmosphere, probably with deep layers of ice, rock or liquid oceans (made of water, ammonia, a mixture of both, or heavier volatiles).

Similar
gas dwarftransitional planet
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Meanings

nounmini-Neptune (plural mini-Neptunes)

plural mini-Neptunes

  1. astronomyA planet less massive than Neptune but resembling Neptune in that it has a thick hydrogen-helium atmosphere, probably with deep layers of ice, rock or liquid oceans (made of water, ammonia, a mixture of both, or heavier volatiles).

    Synonyms: gas dwarf, transitional planet

Synonyms & antonyms

nounA planet less massive than Neptune but resembling Neptune in that it has a thick hydrogen-helium atmosphere, probably with deep layers of ice, rock or liquid oceans (made of water, ammonia, a mixture of both, or heavier volatiles).

Similar
gas dwarftransitional planet
Also see
gas dwarftransitional planet
Cite this entry
APA

mini-Neptune. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/mini-Neptune

MLA

“mini-Neptune.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/mini-Neptune. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “mini-Neptune,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/mini-Neptune.

Source: mini-Neptune on Wiktionary, CC BY-SA 4.0.