an instrument for making visible the motions or properties of a sounding body.
a device for testing the quality of strings for musical instruments.
Origin of phonoscope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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