Definition of diapason noun from the Oxford Advanced American Dictionary

 

diapason

 noun
noun
NAmE//ˌdaɪəˈpeɪzn//
 
, NAmE//ˌdaɪəˈpeɪsn//
 
, NAmE//ˌdaɪəˈpeɪsən//
 
 
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an organ stop that produces a full loud sound
See the Oxford Advanced Learner's Dictionary entry: diapason