{ Pol′y‐op″tron (?), Pol′y‐op″trum (?), } n. [NL., from Gr. πολύσ many + � seen.] (Opt.) A glass through which objects appear multiplied, but diminished in size.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.