Webster's Revised Unabridged Dictionary · 1913

Clastic

Clastic , adjective

[Greek {not transcribed} br{not transcribed}, from {not transcribed} to break.]

1.
Pertaining to what may be taken apart; as, clastic anatomy (of models).
2.
(Mineralogy) Fragmental; made up of brok{not transcribed} fragments; as, sandstone is a clastic rock.