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

 

tumulus

 noun
noun
BrE BrE//ˈtjuːmjələs//
 
; NAmE NAmE//ˈtuːmjələs//
 
(pl. tumuli
BrE BrE//ˈtjuːmjəlaɪ//
 
; NAmE NAmE//ˈtuːmjəlaɪ//
 
)
(specialist)
 
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a large pile of earth built over the grave of an important person in ancient times Word Origin late Middle English: from Latin; related to tumere ‘swell’.
See the Oxford Advanced American Dictionary entry: tumulus