phonoscope
/ˈfəʊnəskəʊp/noun
1Any of various devices by means of which sound vibrations are converted into a visible form, graphical or electronic record, etc.
2In full twin phonoscope A type of otoscope consisting of the united earpiece sections of two stethoscopes. disused. rare.
Origin
Mid 19th century (in an earlier sense). From phono- + -scope.
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