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 ]
n. Volcanic power or action; volcanicity. [ 1913 Webster ]