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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 gray·wacke /ˈgreˌwæk, ˌwækə/
 硬砂岩

From: Webster's Revised Unabridged Dictionary (1913)

 Gray·wacke n.  Geol. A conglomerate or grit rock, consisting of rounded pebbles and sand firmly united together.
 Note: ☞ This term, derived from the grauwacke of German miners, was formerly applied in geology to different grits and slates of the Silurian series; but it is now seldom used.
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