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octane
octane number
octanol
Octans
octant
octapeptide
octavalent
octave
octave coupler
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octave coupler
oc·tave cou·pler (plural oc·tave cou·plers)


noun 
Definition:
 
mechanism for playing octaves simultaneously: a mechanism on an organ or harpsichord that allows somebody simultaneously to play one note and another one an octave higher or lower
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