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

shale

noun
 
/ʃeɪl/
 
/ʃeɪl/
[uncountable]
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  1. 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 shale in the Oxford Advanced American Dictionary

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