Definitions for: Volcanic


[adj] 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"
[adj] explosively unstable; "a volcanic temper"
[adj] 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"



Webster (1913) Definition: Vol*can"ic, a. [Cf. F. volcanique, It. vulcanico.]
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.

Synonyms: eruptive, extrusive, unstable

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