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

 

megalith

 noun
noun
BrE BrE//ˈmeɡəlɪθ//
 
; NAmE NAmE//ˈmeɡəlɪθ//
 
 
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a very large stone, especially one put in a place that was used for ceremonies in ancient times Word Origin mid 19th cent.: back-formation from megalithic, from mega- ‘large’ + Greek lithos ‘stone’.
See the Oxford Advanced American Dictionary entry: megalith