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phonautograph
noun
phon·au·to·graph
\fōˈnȯtəˌgraf, -rȧf\
Definition of phonautograph
: an instrument by which a sound can be made to produce a visible record of itself
phonautographic
adjectivephonautographically
\-fə̇k(ə)lē\ adverbExplore Merriam-Webster
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Origin and Etymology of phonautograph
phon- + aut- + -graph
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