plutonic Meaning, Definition & Usage

  1. adjective satellite of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro
    irruptive.

WordNet

Plu*ton"ic adjective
Etymology
Cf. F. plutonique. See Pluto.
Definitions
  1. Of or pertaining to Pluto; Plutonian; hence, pertaining to the interior of the earth; subterranean.
  2. Of, pertaining to, or designating, the system of the Plutonists; igneous; as, the Plutonic theory.

Webster 1913