01 a. Of or pertaining to a volcano or volcanoes; as, volcanic heat.
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1.
Of or pertaining to a volcano or volcanoes; as, volcanic heat.
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2.
Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa.
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3.
Changed or affected by the heat of a volcano.
Phrases & compounds
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.