1603, in the meaning defined above
Greek tetrachordon, from neuter of tetrachordos of four strings, from tetra- + chordē string — more at yarn
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Cite this Entry
“Tetrachord.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tetrachord. Accessed 6 Oct. 2022.
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Britannica.com: Encyclopedia article about tetrachord
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