Definitions

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

  • noun Any of various dark gray sandstones that contain shale.

from The Century Dictionary.

  • noun In geology, a compact aggregate of rounded or subangular grains of various silicious rocks, held together by a paste which is usually silicious.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geol.) A conglomerate or grit rock, consisting of rounded pebbles and sand firmly united together.

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

  • noun Alternative form of greywacke.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Partial translation of German Grauwacke : grau, gray + Wacke, rock (from Middle High German, from Old High German waggo, boulder; see wegh- in Indo-European roots).]

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