monochord

[ mon-uh-kawrd ]
/ ˈmɒn əˌkɔrd /

noun

an acoustical instrument dating from antiquity, consisting of an oblong wooden sounding box, usually with a single string, used for the mathematical determination of musical intervals.

Origin of monochord

1375–1425; late Middle English monocorde < Medieval Latin monochordum < Greek monóchordon, noun use of neuter of monóchordos with one string. See mono-, chord1
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British Dictionary definitions for monochord

monochord

/ (ˈmɒnəʊˌkɔːd) /

noun

an instrument employed in acoustic analysis or investigation, consisting usually of one string stretched over a resonator of woodAlso called: sonometer (səˈnɒmɪtə)

Word Origin for monochord

C15: from Old French, from Late Latin, from Greek monokhordon, from mono- + khordē string
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