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greywacke

Pronunciation: /ˈgreɪwakə/
(US graywacke)
Definition of greywacke

noun

[mass noun] Geology
  • a dark coarse-grained sandstone containing more than 15 per cent clay: a 120-foot pyramid of battered greywacke a quarter mile offshore [count noun]:the shales and greywackes of the Skiddaw Group

Origin:

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

greywacke in other Oxford dictionaries

Definition of greywacke in the US English dictionary

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