The Collaborative International Dictionary
Plutonist
Plutonist \Plu"to*nist\, n. [Cf. F. plutoniste.] One who adopts the geological theory of igneous fusion; a Plutonian. See Plutonism.
Wiktionary
plutonist
n. One who supports the geological theory of plutonism.
Usage examples of "plutonist".
Plutonists, who noted that volcanoes and earthquakes, among other enlivening agents, continually changed the face of the planet but clearly owed nothing to wayward seas.
The Plutonists also raised awkward questions about where all the water went when it wasn’t in flood.