vol·ca·nic /vɑlˈkænɪk, vɔl ||ˈke-/
1. Of or pertaining to a volcano or volcanoes; as, volcanic heat.
2. Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa.
3. Changed or affected by the heat of a volcano.
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.
adj 1: 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"
2: explosively unstable; "a volcanic temper"
3: 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" [syn: