optical glassn.

Brit.

/ˌɒptᵻkl ˈɡlɑːs/,

/ˌɒptᵻkl ˈɡlas/, U.S.

/ˌɑptək(ə)l ˈɡlæs/

Origin: Formed within English, by compounding. Etymons: optical adj., glass n.¹

Etymology: < optical adj. + glass n.¹ With sense 1 compare earlier optic glass n.

†1. = optic glass n. Obsolete.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > [noun] > instrument for looking through

perspectivec1395

spectaclec1430

prospectionc1460

perspective glass1570

optic1599

optic glass1607

optical glassc1660

glass1700

c1660 J. Evelyn Diary anno 1641 (1955) II. 64 Those spotts in the Moone, attributed to the seas there &c according to our new Philosophy & the Phænomenas by optical Glasses.

1748 Lady Luxborough Let. 28 Apr. in Lett. to W. Shenstone (1775) 18 It would give me pain to see St. James's, Vauxhall, Ranelagh, &c. &c. represented in so lively a manner as I see them through an optical glass which I have lately purchased.

2. Glass of specially high homogeneity manufactured for use in optical components.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > materials > [noun]

mirror glass1440

looking-glassa1631

selenite1668

pebble1688

optical glass1797

tain1858

1797 Jrnl. Nat. Philos. July 181 (heading) Imperfections of Optical Glass.

1830 Philos. Trans. (Royal Soc.) 120 4 I shall confine my present statement altogether to the heavy optical glass.

1879 Encycl. Brit. X. 665/1 Optical glass is of two principal kinds—flint and crown.

1922 L. Bell Telescope iii. 60 The fundamental difference between the making of optical glass and the ordinary commercial varieties lies in the individual treatment of each charge necessary to secure uniformity and regularity.

1992 Harrowsmith Feb. 28/2 Wide exit beams..are less important than the quality of the optical glass and how well it is aligned in the barrels of the binocular.

This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022).

单词	optical glass
释义	optical glassn. Brit. /ˌɒptᵻkl ˈɡlɑːs/, /ˌɒptᵻkl ˈɡlas/, U.S. /ˌɑptək(ə)l ˈɡlæs/ Origin: Formed within English, by compounding. Etymons: optical adj., glass n.¹ Etymology: < optical adj. + glass n.¹ With sense 1 compare earlier optic glass n. †1. = optic glass n. Obsolete. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > [noun] > instrument for looking through perspectivec1395 spectaclec1430 prospectionc1460 perspective glass1570 optic1599 optic glass1607 optical glassc1660 glass1700 c1660 J. Evelyn Diary anno 1641 (1955) II. 64 Those spotts in the Moone, attributed to the seas there &c according to our new Philosophy & the Phænomenas by optical Glasses. 1748 Lady Luxborough Let. 28 Apr. in Lett. to W. Shenstone (1775) 18 It would give me pain to see St. James's, Vauxhall, Ranelagh, &c. &c. represented in so lively a manner as I see them through an optical glass which I have lately purchased. 2. Glass of specially high homogeneity manufactured for use in optical components. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > materials > [noun] mirror glass1440 looking-glassa1631 selenite1668 pebble1688 optical glass1797 tain1858 1797 Jrnl. Nat. Philos. July 181 (heading) Imperfections of Optical Glass. 1830 Philos. Trans. (Royal Soc.) 120 4 I shall confine my present statement altogether to the heavy optical glass. 1879 Encycl. Brit. X. 665/1 Optical glass is of two principal kinds—flint and crown. 1922 L. Bell Telescope iii. 60 The fundamental difference between the making of optical glass and the ordinary commercial varieties lies in the individual treatment of each charge necessary to secure uniformity and regularity. 1992 Harrowsmith Feb. 28/2 Wide exit beams..are less important than the quality of the optical glass and how well it is aligned in the barrels of the binocular. This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022). < n.c1660
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