from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A fine-grained, dark gray to pink sedimentary rock consisting primarily of compacted and hardened clay.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology sedimentary rock composed of fine, clay particles

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun fine-grained rock consisting of compacted clay particles


Sorry, no etymologies found.



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