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

 

diapason

 noun
noun
BrE BrE//ˌdaɪəˈpeɪzən//
 
; NAmE NAmE//ˌdaɪəˈpeɪzən//
 
; BrE BrE//ˌdaɪəˈpeɪsən//
 
; NAmE NAmE//ˌdaɪəˈpeɪsən//
 
 
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an organ stop that produces a full loud sound Word Origin late Middle English (denoting the interval of an octave): via Latin from Greek dia pasōn (khordōn) ‘through all (notes)’.
See the Oxford Advanced American Dictionary entry: diapason