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phonautograph

noun phon·au·to·graph \ fōˈnȯtəˌgraf , -rȧf \
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Definition of phonautograph

: an instrument by which a sound can be made to produce a visible record of itself
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phonautographic

adjective
—

phonautographically

\-fə̇k(ə)lē\ adverb

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Origin and Etymology of phonautograph

phon- + aut- + -graph

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