One of the mysteries of the English language finally explained.
1An organ stop sounding a note two octaves higher than the ordinary pitch; the octave two octaves above a given note.
2In full "superoctave coupler". A device in an organ or similar instrument which enables a note one octave higher than that being played to sound at the same time.
Late 18th century; earliest use found in John Hawkins (1719–1789), music scholar and lawyer. From super- + octave.
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