greywacke

[ grey-wak, -wak-uh ]
/ ˈgreɪˌwæk, -ˌwæk ə /
|

noun


Nearby words

  1. greylag,
  2. greylist,
  3. greyly,
  4. greynville,
  5. greys,
  6. greywether,
  7. grf,
  8. gribble,
  9. grice,
  10. grid

graywacke

or grey·wacke

[ grey-wak, -wak-uh ]
/ ˈgreɪˌwæk, -ˌwæk ə /

noun

Geology. a dark-gray coarse-grained wacke.

Origin of graywacke

1805–15; partly translation, partly adapted from German Grauwache; see wacke

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for greywacke



British Dictionary definitions for greywacke

greywacke

US graywacke

/ (ˈɡreɪˌwækə) /

noun

any dark sandstone or grit having a matrix of clay minerals

Word Origin for greywacke

C19: partial translation of German Grauwacke; see wacke

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Science definitions for greywacke

graywacke

[ grāwăk′, -wăk′ə ]

Any of various dark gray, coarse-grained sandstones that contain abundant feldspar and rock fragments and often have a clay-rich matrix. Graywackes are thought to originate in environments where erosion, transportation, and deposition happen so quickly that minerals and rock fragments do not have sufficient time to break down into finer constituents.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.