octave : Idioms & Phrases
Double octave
(Mus.) , an interval composed of two octaves, or fifteen notes, in diatonic progression; a fifteenth.
Webster 1913
Hidden fifths ∨ octaves
(Mus.) , consecutive fifths or octaves, not sounded, but suggested or implied in the parallel motion of two parts towards a fifth or an octave.
Webster 1913
musical octave
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noun a musical interval of eight tones
octave.
WordNet
Octave flute
(Mus.) , a small flute, the tones of which range an octave higher than those of the German or ordinary flute; called alsopiccolo . SeePiccolo .