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harmonichord

noun
har·​mon·​i·​chord | \härˈmänəˌkȯrd\
plural harmonichords

Definition of harmonichord 

: a 19th-century keyboard instrument in which the strings' tones can be sustained and swelled by means of a rotating cylinder that transfers its vibrations to the strings by means of a rod

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First Known Use of harmonichord

1835, in the meaning defined above

History and Etymology for harmonichord

French harmonicorde, from harmonie harmony (from Old French armonie) + -corde -chord

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The first known use of harmonichord was in 1835

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