plutonic

adjective1

1. •
   Containing plutonium in a higher oxidation state.

adjective4

1. •
   Of or pertaining to rocks formed deep in the Earth's crust, rather than by volcanoes at the surface of the Earth.

   • These cliffs, I may remark, are basaltic, and therefore plutonic. — 1912
2. •
   Synonym of Plutonian (“of or relating to Pluto, the Greek and Roman god of the underworld; demonic, infernal”).
3. •
   Synonym of Plutonian (“of, relating to, or having characteristics associated with the underworld; dark, gloomy; mournful”).
4. •
   (historical) Of, pertaining to, or supporting plutonism (“the theory that the rocks of the Earth were formed in fire by volcanic activity, with a continuing gradual process of weathering and erosion, then deposited on the sea bed, re-formed into layers of sedimentary rock by heat and pressure, and raised again”).