Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A dwarf planet that orbits the sun at a greater distance on average than Neptune.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun astronomy A trans-Neptunian dwarf planet.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Pluto + –oid.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Plut(o) + -oid

Examples

Comments

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  • The new, unfortunate-sounding name for dwarf planets like, umm, Pluto. See this news article for the rationale.

    June 12, 2008