melo·​piano | \¦melō+\
plural melopianos

Definition of melopiano 

: a 19th-century device intended for installation in a piano and containing metal springs that cause small hammers to bounce repeatedly against the piano strings to sustain or swell their sound while producing a tremolo effect

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First Known Use of melopiano

1872, in the meaning defined above

History and Etymology for melopiano

melo- entry 1 + piano

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The first known use of melopiano was in 1872

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