WordReference Random House Unabridged Dictionary of American English © 2025
clas•tic
(klas′tik),USA pronunciation adj.
- Biologybreaking up into fragments or separate portions;
dividing into parts. - pertaining to an anatomical model made up of detachable pieces.
- Geologynoting or pertaining to rock or rocks composed of fragments or particles of older rocks or previously existing solid matter;
fragmental.
- Greek klastós broken in pieces (klas- variant stem of klân to break + -tos verbal adjective, adjectival suffix) + -ic
- 1870–75
'clastic' also found in these entries (note: many are not synonyms or translations):
anticlastic
- cement
- clast
- cytoclastic
- eugeosyncline
- fragmental
- lithic
- orthoclastic
- pyroclastic
- tephra
- volcaniclastic