[klast] 
| a grain of sediment, silt, sand, gravel, etc., esp. as a constituent fragment of a clastic rock formation, as distinguished from a chemical or biogenic component of such a formation. |
| clast (klāst) n. A rock fragment or grain resulting from the breakdown of larger rocks. [From Greek klastos, broken, from klān, to break.] |
| clast (klāst) Pronunciation Key
A rock fragment or grain resulting from the breakdown of larger rocks. clastic adjective (klās'tĭk) |
