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phonoscope

[foh-nuh-skohp]
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noun
  1. an instrument for making visible the motions or properties of a sounding body.
  2. 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. 2018

British Dictionary definitions for phonoscope

phonoscope

noun
  1. a device that renders visible the vibrations of sound waves
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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