Looking for the meaning or definition of the word opeidoscope? Here's what it means.
Noun
An instrument, consisting of a tube with one end open and the other end covered with a thin flexible membrane with a mirror attached to its centre, used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds that enter the tube.
Examples
I can't help thinking that, had he lived to see the electronic cricket sensor, the inventor of the opeidoscope probably would have approved.