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pyroclastic

[pahy-ruh-klas-tik] /ˌpaɪ rəˈklæs tɪk/
adjective, Geology
1.
composed chiefly of fragments of volcanic origin, as agglomerate, tuff, and certain other rocks; volcaniclastic.
Origin
1885-1890
1885-90; pyro- + clastic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pyro-clastic

pyroclastic

/ˌpaɪrəʊˈklæstɪk/
adjective
1.
(of rocks) formed from the solid fragments ejected during a volcanic eruption
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
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Word Origin and History for pyro-clastic

pyroclastic

adj.

1887, from pyro- + clastic.

Online Etymology Dictionary, © 2010 Douglas Harper
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pyro-clastic in Science
pyroclastic
  (pī'rō-klās'tĭk)   
Composed chiefly of rock fragments of explosive origin, especially those associated with explosive volcanic eruptions. Volcanic ash, obsidian, and pumice are examples of pyroclastic materials.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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