Definition of phonodeik
: 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) — more at diction
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