phonoscope

[ foh-nuh-skohp ]
/ ˈfoʊ nəˌskoʊp /

noun

an instrument for making visible the motions or properties of a sounding body.
a device for testing the quality of strings for musical instruments.

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Origin of phonoscope

First recorded in 1880–85; phono- + -scope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for phonoscope

phonoscope
/ (ˈfəʊnəˌskəʊp) /

noun

a device that renders visible the vibrations of sound waves
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012