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pyriform
pyrimethamine
pyrimidine
pyrite
pyro-
pyrocatechol
pyrocellulose
pyrochemical
pyroclastic
pyroconductivity
pyroelectricity
pyrogallol
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pyrography
pyroligneous acid
pyrolusite
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pyroclastic
py·ro·clas·tic [ prō klástik ]


adjective 
Definition:
 
with fragmentary texture: describes sedimentary rock that is composed of fragments of volcanic rock produced by the explosion of a volcanic eruption ( pyroclastic flow )

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