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suboctave coupler

noun
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Definition of suboctave coupler

: an organ coupler for making the tone an octave below sound together with the tone struck

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“Suboctave coupler.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/suboctave%20coupler. Accessed 19 Sep. 2020.

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