Definition of megalith noun from the Oxford Advanced American Dictionary

 

megalith

 noun
noun
NAmE//ˈmɛɡəˌlɪθ//
 
 
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a very large stone, especially one put in a place that was used for ceremonies in ancient times
NAmE//ˌmɛɡəˈlɪθɪk//
 
adjective megalithic monuments
See the Oxford Advanced Learner's Dictionary entry: megalith