Definition of shale noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ʃeɪl//
; NAmE NAmE//ʃeɪl//
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a type of soft stone that splits easily into thin flat layers Word Originmid 18th cent.: probably from German Schale; related to English dialect shale ‘dish’ (see scale sense 5).
See the Oxford Advanced American Dictionary entry: shale

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