Dictionary![]() ![]() py•ro•clas•ticPronunciation: (pī"ru-klas'tik), [key] —adj. Geol. composed chiefly of fragments of volcanic origin, as agglomerate, tuff, and certain other rocks; volcaniclastic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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