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volcanic glass

See more synonyms for volcanic glass on Thesaurus.com
noun
  1. a natural glass produced when molten lava cools very rapidly; obsidian.
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Origin of volcanic glass

First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for volcanic glass

Historical Examples

  • She armed herself with an obsidian or volcanic-glass knife, and waited their coming.

    Legends of Ma-ui--a demi god of Polynesia, and of his mother Hina

    W. D. Westervelt


British Dictionary definitions for volcanic glass

volcanic glass

noun
  1. any of several glassy volcanic igneous rocks, such as obsidian and pitchstone
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

volcanic glass in Science

volcanic glass

  1. Natural glass produced by the cooling of molten lava too quickly to permit crystallization. Obsidian is a type of volcanic glass.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.