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graywacke

Syllabification: (gray·wacke)
Pronunciation: /ˈgrāˌwak, -ˌwakə/
(British greywacke)
Definition of graywacke

noun

Geology
  • a dark coarse-grained sandstone containing more than 15 percent clay.

Origin:

late 18th century (as grauwacke): from German Grauwacke, from grau 'gray' + wacke. The anglicized form dates from the early 19th century

graywacke in other Oxford dictionaries

Definition of graywacke in the British & World English dictionary

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