volcanic glass

  1. a natural glass produced when molten lava cools very rapidly; obsidian.

Origin of volcanic glass

First recorded in 1830–40

Words Nearby volcanic glass

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use volcanic glass in a sentence

British Dictionary definitions for volcanic glass

volcanic glass

  1. any of several glassy volcanic igneous rocks, such as obsidian and pitchstone

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

Scientific definitions for volcanic glass

volcanic glass

  1. Natural glass produced by the cooling of molten lava too quickly to permit crystallization. Obsidian is a type of volcanic glass.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.