† polyoptronn.

Forms: 1700s polyoptrum, 1800s polyoptron.

Origin: A borrowing from Greek, combined with an English element. Etymons: poly- comb. form, Greek -οπτρον.

Etymology: < poly- comb. form + ancient Greek -οπτρον (in e.g. κάτοπτρον mirror: see catoptric adj. and n.), naming instruments of sight. Compare earlier polyscope n.In form polyoptrum after Latin nouns in -um. N.E.D. (1907) gives the pronunciations as (pǫliˌǫ·ptrǫ̆n) /pɒlɪˈɒptrən/ and (-ɒ̆m) /-əm/.

Obsolete. rare.

A lens that is plane on one side and has many concave facets cut into the other, multiplying the image of an object; a multiplying-glass. Cf. polyhedron n. 2, polyscope n. 1.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > multiplying glass

multiplying-glass1628

polyscope1684

polyhedron1721

polyoptron1728

1728 E. Chambers Cycl. Polyoptrum,..a Glass through which Objects appear multiplied, but diminished.

1842 W. T. Brande Dict. Sci., Lit. & Art 957/2 Polyoptron, a glass through which objects appear multiplied, but diminished. It consists of a lens one side of which is plane, but in the other are ground several spherical concavities.

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online December 2020).

单词	polyoptron
释义	† polyoptronn. Forms: 1700s polyoptrum, 1800s polyoptron. Origin: A borrowing from Greek, combined with an English element. Etymons: poly- comb. form, Greek -οπτρον. Etymology: < poly- comb. form + ancient Greek -οπτρον (in e.g. κάτοπτρον mirror: see catoptric adj. and n.), naming instruments of sight. Compare earlier polyscope n.In form polyoptrum after Latin nouns in -um. N.E.D. (1907) gives the pronunciations as (pǫliˌǫ·ptrǫ̆n) /pɒlɪˈɒptrən/ and (-ɒ̆m) /-əm/. Obsolete. rare. A lens that is plane on one side and has many concave facets cut into the other, multiplying the image of an object; a multiplying-glass. Cf. polyhedron n. 2, polyscope n. 1. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > multiplying glass multiplying-glass1628 polyscope1684 polyhedron1721 polyoptron1728 1728 E. Chambers Cycl. Polyoptrum,..a Glass through which Objects appear multiplied, but diminished. 1842 W. T. Brande Dict. Sci., Lit. & Art 957/2 Polyoptron, a glass through which objects appear multiplied, but diminished. It consists of a lens one side of which is plane, but in the other are ground several spherical concavities. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online December 2020). < n.1728
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