superoctave

nounB2

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noun

Plural noun:

superoctaves

1.
(music) The octave above another.
Succeeding superoctaves are pitches found at frequencies four, eight, sixteen times, and so on, of the fundamental frequency.
2.
(music) A coupler in the organ by means of which is sounded an octave higher than the one struck.
3.
(music) An organ stop two octaves above the principal.

From super- + octave.