| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| graywacke |
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| SYLLABICATION: | gray·wacke |
| PRONUNCIATION: |  gr  w k , -wk |
| NOUN: | Any of various dark gray sandstones that contain shale. | | ETYMOLOGY: | Partial translation of German Grauwacke : grau, gray + Wacke, rock (from Middle High German, from Old High German waggo, boulder; see wegh- in Appendix I).
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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