'Volcanic glass' definitions:
Definition of 'volcanic glass'
(from WordNet)
noun
A kind of natural glass produced when molten lava cools very rapidly
Definition of 'Volcanic glass'
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]