† 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
随便看	to fling the house out of the window to fling the house out of the windows to fling throw one's cap over the windmill to fling to to fling to death to fling together to fling up to fling wide to fling, give, throw, etc to the winds to flip to flip a person off to flip a person the bird to flip burgers to flip off to flip one's lid to flip one's wig to flip out to flip the bird to give one snuff to give one sock to give one socks to give one suspicion to give one the back to give one the bag to hold to give one the double