What's the difference between volcanist and vulcanist?

Volcanist

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Definition:

• (n.) One versed in the history and phenomena of volcanoes.
• (n.) One who believes in the igneous, as opposed to the aqueous, origin of the rocks of the earth's crust; a vulcanist. Cf. Neptunist.

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Vulcanist

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Definition:

• (n.) A volcanist.

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