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)



Log in or sign up to get involved in the conversation. It's quick and easy.

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

    May 16, 2009