superoctave

noun
su·​per·​octave | \ ¦süpə(r)+\
plural superoctaves

Definition of superoctave

1 : the octave above a specific note
2 Super Octave or less commonly Superoctave plural Super Octaves also Superoctaves : a metal organ flue stop of 2′ pitch in the manuals and 4′ pitch in the pedals

called also Fifteenth

History and Etymology for superoctave

super- + octave

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