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

  • adj. Of deep igneous or magmatic origin: plutonic rocks.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. An igneous rock that cooled and hardened below the earth's surface.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Of or pertaining to Pluto; Plutonian; hence, pertaining to the interior of the earth; subterranean.
  • adj. Of, pertaining to, or designating, the system of the Plutonists; igneous.

from The Century Dictionary and Cyclopedia

  • Of or relating to Pluto or the regions of fire; subterranean; dark
  • Pertaining to or designating the system of the Plutonists: as, the Plutonic theory.
  • In geology, formed deep below the surface.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro


From Latin Plūtō, Plūtōn-, Pluto; see Pluto.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French plutonique ("of or pertaining to Pluto, the underworld, interior of the earth") (Wiktionary)


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  • adjective, Of or pertaining to a relationship that could/should only exist in outer space.

    May 16, 2009