WINDOW, n. [ G. The vulgar pronunciation is windor, as if from the Welsh gwyntdor, wind-door.]

1. An opening in the wall of a building for the admission of light, and of air when necessary. This opening has a frame on the sides, in which are set movable sashes, containing panes of glass. In the United States, the sashes are made to rise and fall, for the admission or exclusion of air. In France, windows are shut with frames or sashes that open and shut vertically, like the leaves of a folding door.
2. An aperture or opening. A window shalt thou make to the ark. – Gen. vi.
3. The frame or other thing that covers the aperture. Ere I let fall the windows of mine eyes. – Shak.
4. An aperture; or rather the clouds or water-spouts. The windows of heaven were opened. – Gen. vii.
5. Lattice or casement; or the net work of wire used before the invention of glass. Judges v.
6. Lines crossing each other. Till he has windows on his bread and butter. – King.

1. To furnish with windows. – Wotton. Pope.
2. To place at a window. [Unusual.]
3. To break into openings. [Unusual.] – Shak.

1. An opening in the wall of a building for the admission of light and air, usually closed by casements or sashes containing some transparent material, as glass, and capable of being opened and shut at pleasure.
   
   

   I leaped from the window of the citadel. Shak.

   Then to come, in spite of sorrow,
   And at my window bid good morrow. Milton.

2. To furnish with windows.
3. The shutter, casement, sash with its fittings, or other framework, which closes a window opening.
4. To place at or in a window.
   
   
   [R.]

   Wouldst thou be windowed in great Rome and see
   Thy master thus with pleach'd arms, bending down
   His corrigible neck? Shak.

5. A figure formed of lines crossing each other.
   
   
   [R.]

   Till he has windows on his bread and butter. King.

   French window (Arch.), a casement window in two folds, usually reaching to the floor; -- called also French casement. -- Window back (Arch.), the inside face of the low, and usually thin, piece of wall between the window sill and the floor below. -- Window blind, a blind or shade for a window. -- Window bole, part of a window closed by a shutter which can be opened at will. [Scot.] -- Window box, one of the hollows in the sides of a window frame for the weights which counterbalance a lifting sash. -- Window frame, the frame of a window which receives and holds the sashes or casement. -- Window glass, panes of glass for windows; the kind of glass used in windows. -- Window martin (Zoöl.), the common European martin. [Prov. Eng.] -- Window oyster (Zoöl.), a marine bivalve shell (Placuna placenta) native of the East Indies and China. Its valves are very broad, thin, and translucent, and are said to have been used formerly in place of glass. -- Window pane. (a) (Arch.) See Pane, n., 3 (b). (b) (Zoöl.) See Windowpane, in the Vocabulary. -- Window sash, the sash, or light frame, in which panes of glass are set for windows. -- Window seat, a seat arranged in the recess of a window. See Window stool, under Stool. -- Window shade, a shade or blind for a window; usually, one that is hung on a roller. -- Window shell (Zoöl.), the window oyster. -- Window shutter, a shutter or blind used to close or darken windows. -- Window sill (Arch.), the flat piece of wood, stone, or the like, at the bottom of a window frame. -- Window swallow (Zoöl.), the common European martin. [Prov. Eng.] -- Window tax, a tax or duty formerly levied on all windows, or openings for light, above the number of eight in houses standing in cities or towns. [Eng.]