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The Collaborative International Dictionary

Volcanist

Volcanist \Vol"can*ist\, n. [Cf. F. volcaniste, vulcaniste.]

  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.

Wiktionary

volcanist

n. (context volcanology English) Someone interested in volcanism and volcanology the study of volcanoes.