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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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Examples from the web for pyroclastic
  • Above this coarse pumice-fall layer, layers of pyroclastic flow and tephra fall deposits record changes in the eruption.
  • pyroclastic surges are low-density versions of the pyroclastic flow.
  • pyroclastic flows can generate lahars by melting snow and ice.
  • The outer flanks of the asymmetrical pyroclastic shield volcano are formed by thick pyroclastic-flow deposits.
  • Dark streaks on pyroclastic-flow deposits are lahar deposits generated by rains.
  • Lower-density pyroclastic flows, called pyroclastic surges, can easily overflow ridges hundreds of feet high.
  • Gases, lava, and pyroclastic material are erupted from volcanic vents.
British Dictionary definitions for pyroclastic

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 pyroclastic
adj.

1887, from pyro- + clastic.

Online Etymology Dictionary, © 2010 Douglas Harper
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pyroclastic 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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