Английский разговорный словарь (основной) - diapason

ˌdaɪəˈpeɪsn n. Mus. 1 the compass of a voice or musical instrument. 2 a fixed standard of musical pitch. 3 (in full open or stopped diapason) either of two main organ-stops extending through the organ's whole compass. 4 a a combination of notes or parts in a harmonious whole. b a melodious succession of notes, esp. a grand swelling burst of harmony. 5 an entire compass, range, or scope. [ME in sense 'octave' f. L diapason f. Gk dia pason (khordon) through all (notes)]