English

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

 

roundel

 noun
noun
BrE BrE//ˈraʊndl//
 
; NAmE NAmE//ˈraʊndl//
 
(specialist)
 
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a round design that is used as a decoration or to identify an aircraft Word Origin Middle English: from Old French rondel, from ro(u)nd-, from a variant of Latin rotundus ‘rotund’.
See the Oxford Advanced American Dictionary entry: roundel