See Also: pyroclastic(dictionary)

pyroclastic (iou)



pyroclastic adjective & noun. L19.
[from PYRO- + CLASTIC.]
Geology.
A. adjective. Pertaining to or designating fragmental rocks of volcanic origin. L19.
b. noun. A pyroclastic rock or rock fragment. E20.
'pyroclast noun a pyroclastic rock fragment E20.