greywacke - WordReference.com Dictionary of English

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- - grey matter
  - grey mullet
  - grey seal
  - grey squirrel
  - grey water
  - greybeard
  - greyhen
  - greyhound
  - greylag
  - greyscale
  - greywacke
  - gricer
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greywacke

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Concise Oxford English Dictionary © 2008 Oxford University Press:
greywacke /ˈgreɪwakə/ (US graywacke)

▶noun Geology a dark coarse-grained sandstone containing more than 15 per cent clay.

– origin C18 (as grauwacke): from Ger. Grauwacke, from grau ‘grey’ + wacke.

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