Definition of pyroclast in English:

pyroclast

noun

Geology
  • See pyroclastic

    • ‘Eruption at the surface then yields initial tephrite, typically erupted as pyroclasts.’
    • ‘These fluids altered and metasomatized the previously emplaced volcanic products (lavas, pyroclasts).’

Pronunciation

pyroclast

/ˈpʌɪrə(ʊ)klast/