Pyroclastic meaning

pī'rō-klăs'tĭk
Composed chiefly of rock fragments or particles of volcanic origin, such as pumice, obsidian, or volcanic ash.
adjective
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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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Of or having to do with rocks formed from material that was explosively ejected from a volcano.
adjective
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(volcanology) Mostly composed of rock fragments of volcanic origin or comminuted during an eruption.
adjective
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A rock mostly composed of rock fragments of volcanic origin.
noun
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Origin of pyroclastic

From pyro- +"Ž clastic, from Ancient Greek πῦρ (pur, “fire"), and κλαστός (klastos, “broken").