Definition of super-octave in English:

super-octave

noun

Music
  • 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.

Origin

Late 18th century; earliest use found in John Hawkins (1719–1789), music scholar and lawyer. From super- + octave.