'Volcanic' definitions:

Definition of 'volcanic'

From: WordNet
adjective
Relating to or produced by or consisting of volcanoes; "volcanic steam"; "volcanic islands such as Iceland"; "a volcanic cone is a conical mountain or hill built up of material from volcanic eruptions"
adjective
Explosively unstable; "a volcanic temper"
adjective
Igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt; "volcanic rock includes the volcanic glass obsidian"

Definition of 'Volcanic'

From: GCIDE
  • Volcanic \Vol*can"ic\, a. [Cf. F. volcanique, It. vulcanico.]
  • 1. Of or pertaining to a volcano or volcanoes; as, volcanic heat. [1913 Webster]
  • 2. Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa. [1913 Webster]
  • 3. Changed or affected by the heat of a volcano. [1913 Webster]
  • Volcanic bomb, a mass ejected from a volcano, often of molten lava having a rounded form.
  • Volcanic cone, a hill, conical in form, built up of cinders, tufa, or lava, during volcanic eruptions.
  • Volcanic foci, the subterranean centers of volcanic action; the points beneath volcanoes where the causes producing volcanic phenomena are most active.
  • Volcanic glass, the vitreous form of lava, produced by sudden cooling; obsidian. See Obsidian.
  • Volcanic mud, fetid, sulphurous mud discharged by a volcano.
  • Volcanic rocks, rocks which have been produced from the discharges of volcanic matter, as the various kinds of basalt, trachyte, scoria, obsidian, etc., whether compact, scoriaceous, or vitreous. [1913 Webster]