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volcanist
From The Collaborative International Dictionary of English v.0.48:
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]

