from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. one of the major groups of rock that makes up the crust of the Earth; formed by the deposition of either the weathered remains of other rocks, the results of biological activity, or precipitation from solution
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. rock formed from consolidated clay sediments
Sorry, no etymologies found.