| Definitions | | pyroclastic flow |
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noun
- A flow of volcanic ash, dust, rocks and debris that cascades down the slope of a volcano during an eruption. Pyroclastic flows are very dangerous, reaching speeds greater than 60 miles per hour and temperatures in excess of 800 degrees Farenheit.
- 2004, China Miéville, Iron Council, p. 465 (2005 Trade paperback edition) -- In burning slabs like the top of the tower slewed off, militia pods falling out and tumbling.
Etymology: From Greek pyro (fire) and klastos (broken}
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