Volcanist

1. 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.
2. n. One versed in the history and phenomena of volcanoes.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.