a natural glass produced when molten lava cools very rapidly; obsidian.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use volcanic glass in a sentence
Dragonglass: The name accorded to volcanic glass or obsidian.
Women cut themselves with sharp sea-shells or flakes of volcanic glass till the blood ran down.The Long White Cloud | William Pember Reeves
The southern end is formed of volcanic glass, or obsidian, as true a glass as any artificially produced.My Native Land | James Cox
He had lain five of his best arrows, tipped with points of volcanic glass, side by side in the snow.Johnny Longbow | Roy J. Snell
We have here found our first specimens of petrifactions and obsidian, or volcanic glass.The Discovery of Yellowstone Park | Nathaniel Pitt Langford
The walls glistened with the sparkling smoothness of volcanic glass.Astounding Stories, April, 1931 | Various
British Dictionary definitions for volcanic glass
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
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.