"Plutonian" is a word in ENGLISH

Relating to what is now called the Plutonic theory of the earth, first advanced by Dr. James Hutton.

Of, pertaining to, or designating, the system of the Plutonists; igneous; as, the Plutonic theory.

Of or pertaining to Pluto; Plutonian; hence, pertaining to the interior of the earth; subterranean.

The theory, early advanced in geology, that the successive rocks of the earth's crust were formed by igneous fusion; -- …

One who adopts the geological theory of igneous fusion; a Plutonian. See Plutonism.

The science which treats of phenomena due to plutonic action, as in volcanoes, hot springs, etc.