octave coupler

British

noun

a mechanism on an organ and on some harpsichords that enables keys or pedals an octave apart to be played simultaneously

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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octave coupler

The octave coupler stop, sometimes called Harmonique, controls an arrangement whereby, when a key is depressed, its octave is made to sound also.

From Piano Tuning A Simple and Accurate Method for Amateurs by J. Cree (Jerry Cree) Fischer

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023