diapason
noun /ˌdaɪəˈpeɪzən/, /ˌdaɪəˈpeɪsən/
/ˌdaɪəˈpeɪzən/, /ˌdaɪəˈpeɪsən/
- an organ stop that produces a full loud soundWord Originlate Middle English (denoting the interval of an octave): via Latin from Greek dia pasōn (khordōn) ‘through all (notes)’.