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pyroclastic

   Also found in: Wikipedia, Hutchinson 0.17 sec.
py·ro·clas·tic  (pr-klstk)
adj.
Composed chiefly of rock fragments of volcanic origin.
pyroclastic  (pr-klstk)
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.


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