Prax‐in″o‐scope (?), n. [Gr. � action + -scope.] (Opt.) An instrument, similar to the phenakistoscope, for presenting to view, or projecting upon a screen, images the natural motions of real objects.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.