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opeidoscope
noun
opei·do·scope
\ōˈpīdəˌskōp\
Definition of opeidoscope
: an instrument consisting essentially of a tube across one end of which is stretched a thin flexible membrane bearing a small mirror and used for exhibiting upon a screen by rays reflected from the mirror vibratory motions caused by sounds
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Origin and Etymology of opeidoscope
Greek opa (accusative) voice + eidos form + English -scope
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