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]
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