D defs.my
Entry 2 senses Webster, 1913

Volcanist

· Vol·can·ist · IPA
01 n. One versed in the history and phenomena of volcanoes.
  1. 1.
    One versed in the history and phenomena of volcanoes.
  2. 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. See: Neptunist