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Adjective: pyroclastic  ,pI-row'klas-tik or ,pI-ru'klas-tik
  1. Made up of or containing rock fragments or ash from a volcanic eruption
    "Many pyroclastic flows form by the fallback of volcanic ash clouds that originally jetted upward"

Encyclopedia: Pyroclastic

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pyrimidine
pyrite
pyrites
pyro-
pyrocellulose
Pyrocephalus
Pyrocephalus rubinus mexicanus
pyrochemical
pyrochemical process
pyrochemistry
pyroclastic
pyroelectric
pyroelectric material
pyroelectrical
pyroelectricity
pyrogallic
pyrogallic acid
pyrogallol
pyrogen
pyrogenetic
pyrogenic