phonodeik

noun pho·no·deik \ ˈfōnəˌdīk \

Definition of phonodeik

plural -s
:an instrument for making photographic records of sound waves in air by means of a tiny mirror that is oscillated in a rotary manner by sound waves agitating a glass diaphragm and that by its reflections of a ray of light traces corresponding paths on a moving film

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Origin and Etymology of phonodeik

phon- + -deik (from Greek deiknynai to show)


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