Greywacke
//ˈɡɹeɪ.wæk//
"Greywacke" in a Sentence (1 examples)
Endless bleak, rounded hills composed of shales and ribs of tough ‘greywackes’ make up the Southern Uplands – all of such rocks were originally deposited under marine conditions.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.