Definition of pyroclastic flow in English:

pyroclastic flow

noun

Geology
  • A dense, destructive mass of very hot ash, lava fragments, and gases ejected explosively from a volcano and typically flowing downslope at great speed.

    • ‘And they also say there's a potential danger from pyroclastic flows.’
    • ‘The eruption has been characterized by lava dome extrusion, dome-collapse pyroclastic flows and explosive activity.’
    • ‘The pyroclastic deposits mainly consist of block-and-ash, blast, tephra fallout and secondary pyroclastic flow deposits.’
    • ‘They may be buried in place by inundation of sediment or even by lavas or pyroclastic flows.’
    • ‘Even scarier and more destructive than volcanic mudflows are pyroclastic flows or glowing avalanches.’