Volcanic foci
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]


The Collaborative International Dictionary of English. 2000.

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