Volcanist \Vol"can*ist\, n. [Cf. F. volcaniste, vulcaniste.]
1. One versed in the history and phenomena of volcanoes.
[1913 Webster]
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}.
[1913 Webster]