from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A rock fragment or grain resulting from the breakdown of larger rocks.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a fragment of rock that was broken from a larger rock or rock unit.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (geology) a constituent fragment of a clastic rock
From Greek klastos, broken, from klān, to break.(American Heritage® Dictionary of the English Language, Fourth Edition)
Back-formation from clastic. (Wiktionary)