phonautograph
noun
phon·au·to·graph
fōˈnȯtəˌgraf,
-rȧf
: an instrument by which a sound can be made to produce a visible record of itself
phonautographic adjective
⸗¦⸗⸗¦grafik
phonautographically adverb
-fə̇k(ə)lē
Word History
Etymology
phon- + aut- + -graph