Bible Dictionaries
Opeidoscope
Webster's Dictionary
(n.) An instrument, consisting of a tube having one end open and the other end covered with a thin flexible membrance to the center of which is attached a small mirror. It is used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds produced at the open end of the tube, as by speaking or singing into it.
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Bibliography Information
Webster, Noah. Entry for 'Opeidoscope'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​o/opeidoscope.html. 1828.