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greywacke

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈɡreɪˌwækə/US:USA pronunciation: respellingUSA pronunciation: respelling(grā′wak′, -wak′ə)

grey•wacke (grā′wak′, -wak′ə),USA pronunciation n.

Geologygraywacke.

Collins Concise English Dictionary © HarperCollins Publishers::

greywacke, US graywacke /ˈɡreɪˌwækə/ n

any dark sandstone or grit having a matrix of clay minerals

Etymology: 19th Century: partial translation of German Grauwacke; see wacke

'greywacke' also found in these entries (note: many are not synonyms or translations):

graywacke

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greywacke