Pyroclastic (adj)
piy-ro-klas-tik
(Geology) composed chiefly of fragments of volcanic origin.
First recorded in 1885–90; pyro- + clastic.
Example sentences
“We are here at Mount Vesuvius, surrounded by pyroclastic rock.”
Author Juno Dawson, and author and BookToker Andy Darcy Theo are joining the judging panel for 2026’s YA Book Prize. Celebrating the best YA fiction in the UK & Ireland…







