adjective Geology.
composed chiefly of fragments of volcanic origin, as agglomerate, tuff, and certain other rocks; volcaniclastic.

1885–90; pyro- + clastic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyroclastic (ˌpaɪrəʊˈklæstɪk)
(of rocks) formed from the solid fragments ejected during a volcanic eruption

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pyroclastic   (pī'rō-klās'tĭk)  Pronunciation Key 
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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Example sentences
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.
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