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

  • adjective Of deep igneous or magmatic origin.

from The Century Dictionary.

  • 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 the GNU version of the Collaborative International Dictionary of English.

  • adjective Of or pertaining to Pluto; Plutonian; hence, pertaining to the interior of the earth; subterranean.
  • adjective Of, pertaining to, or designating, the system of the Plutonists; igneous.
  • adjective (Geol.) the influence of volcanic heat and other subterranean forces under pressure.
  • adjective (Geol.) granite, porphyry, and some other igneous rocks, supposed to have consolidated from a melted state at a great depth from the surface. Cf. Intrusive rocks, under Intrusive.
  • adjective (Geol.) See Plutonism.

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

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

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

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


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

[From Latin Plūtō, Plūtōn-, Pluto; see Pluto.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From French plutonique ("of or pertaining to Pluto, the underworld, interior of the earth")


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

    May 16, 2009