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graylag goose | grayling | grayly | grayness | graystone | graywacke | graz | graze | grazed | grazer | grazier

graywacke

 : 
Noun
 : 
gray=wacke

CIDE DICTIONARY

graywacken. [G. grauwacke; grau gray + wacke wacke. See Gray, and Wacke, and cf. Grauwacke.].
     A conglomerate or grit rock, consisting of rounded pebbles and sand firmly united together.  [1913 Webster]
    " This term, derived from the grauwacke of German miners, was formerly applied in geology to different grits and slates of the Silurian series; but it is now seldom used."  [1913 Webster]

OXFORD DICTIONARY

graywacke, US var. of GREYWACKE.


For further exploring for "graywacke" in Webster Dictionary Online


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