What does "mini-neptune" mean?

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).

What is a synonym for "mini-neptune"?

Common synonyms include: gas dwarf, transitional planet.

Mini-neptune

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
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).

Synonyms

All synonyms

gas dwarf transitional planet

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