Definition of "sash"

So much for the silk in Judea, called shesh in Hebrew, whence haply that fine linen or silk is called sashes, worn at this day about the heads of eastern people.

1650, Thomas Fuller, “The Land of Moriah”, in A Pisgah Sight of Palestine and the Confines thereof; with the History of the Old and New Testament Acted thereon. […], London: William Tegg, published 1869, book II, paragraph 24, page 279

[…] the Costume of the Sans-culotte Constitution of 1793 was absolutely insufferable […] but now they are so powdered and perfumed, and ribanded, and sashed and plumed, that […] there is something in it more grand and noble, something more suitable to an awful Roman Senate, receiving the homage of dependant Tetrarchs.

1796, Edmund Burke, Letters on a Regicide Peace, Letter IV to the Earl Fitzwilliam, in The Works of the Right Honourable Edmund Burke, London: C. and J. Rivington, 1826, Volume 9, p. 46

One Morning he pulls off his Diamond Ring, and vvrites upon the Glaſs of the Saſh in my Chamber this Line, You I Love, and you alone.

1722 (indicated as 1721), [Daniel Defoe], The Fortunes and Misfortunes of the Famous Moll Flanders, &c. […], London: […] W[illiam Rufus] Chetwood, […]; and T. Edling, […], published 1722, page 91

Away to the window I flew like a flash, / Tore open the shutters, and threw up the sash.

1823, Clement Clarke Moore, “Account of a Visit from St. Nicholas” (“The Night before Christmas”)

"In judging of that tempestuous wind called Euroclydon," says an old writer—of whose works I possess the only copy extant—"it maketh a marvellous difference, whether thou lookest out at it from a glass window where the frost is all on the outside, or whether thou observest it from that sashless window, where the frost is on both sides, and of which the wight Death is the only glazier."

1851 November 14, Herman Melville, chapter II, in Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley, page 10

She chiefly recalled the Square under snow; cold mornings, and the coldness of the oil-cloth at the window, and the draught of cold air through the ill-fitting sash (it was put right now)!

1908, Arnold Bennett, The Old Wives’ Tale‎, Book 4, Chapter 2

Each hood is equipped with two sliding sashes, glazed with polished plate wire-glass; […]

1915 April, W. A. Hamor, “Description of the New Building of the Mellon Institute”, in The Journal of Industrial and Engineering Chemistry‎, page 334

[…] it [fume hood] also affords an excellent physical barrier on all four sides of a reacting system when the sash is pulled down.

2008, Kenneth L. Williamson, Katherine M. Masters, Macroscale and Microscale Organic Experiments‎, published 2015, page 35

The old Bow-windows he will have preserv'd, but will not have them sash’d,

1741, Samuel Richardson, Pamela‎, London, Volume 3, Letter 1, p. 2