polyoptron

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polyoptron
‖ polyoptron, -um (pɒlɪˈɒptrən, -əm) [mod.L., f. Gr. πολυ-, poly- + -οπτρον, naming instruments of sight: see diopter.] An optical instrument through which objects appear multiplied; a multiplying-glass (see quot. 1842). Cf. polyscope 1.1727–41 Chambers Cycl., Polyoptrum,..a glass through which obje... Oxford English Dictionary
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2
polyscope
polyscope (ˈpɒlɪskəʊp) [f. poly- + -scope; so F. polyscope. Cf. Gr. πολύσκοπος far-seeing.] 1. An optical instrument through which objects appear multiplied; a multiplying-glass: spec. (see quot. 1842). Cf. polyoptron.1704 J. Harris Lex. Techn. I, Polyscopes, or Multiplying Glasses, are such as repr... Oxford English Dictionary
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