Volcanist
Pronunciation : Vol"can*ist
Part of Speech : n.
Etymology : [Cf. F. volcaniste, vulcaniste.]
Definition : 1. One versed in the history and phenomena of volcanoes.
2. One who believes in the igneous, as opposed to the aqueous, origin of the rocks of the earth's crust; a vulcanist. Cf. Neptunist.
Source : Webster's Unabridged Dictionary, 1913