plutonic

from WordNet (r) 3.0 (2006)

plutonic
    adj 1: of igneous rock that has solidified beneath the earth's
           surface; granite or diorite or gabbro [syn: {irruptive},
           {plutonic}]

from The Collaborative International Dictionary of English v.0.48

Plutonic \Plu*ton"ic\, a. [Cf. F. plutonique. See {Pluto}.]
   1. Of or pertaining to Pluto; Plutonian; hence, pertaining to
      the interior of the earth; subterranean.
      [1913 Webster]

   2. Of, pertaining to, or designating, the system of the
      Plutonists; igneous; as, the Plutonic theory.
      [1913 Webster]

   {Plutonic action} (Geol.), the influence of volcanic heat and
      other subterranean forces under pressure.

   {Plutonic rocks} (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}.

   {Plutonic theory}. (Geol.) See {Plutonism}.
      [1913 Webster]