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

 

cavern

 noun
noun
BrE BrE//ˈkævən//
 
; NAmE NAmE//ˈkævərn//
 
 
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a cave, especially a large one The underground cavern was formed where water used to flow. Word Origin late Middle English: from Old French caverne or from Latin caverna, from cavus ‘hollow’. Compare with cave.
See the Oxford Advanced American Dictionary entry: cavern

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