Illustrated Architecture Dictionary
Parts of a window
Types of glass
Types of windows
Band/ribbon: One of a horizontal series of three windows or more, separated only by mullions, that form a horizontal band across the facade of a building In the US, most commonly found in buildings erected after 1900.
Casing: The exposed trim molding, framing, or lining around a door or window; may be either flat or molded.
Chicago: A wide fixed pane with narrow movable sash windows flanking it.
Double-hung: A window having two vertically sliding sashes, each designed to close a different half of the window.
Double window: two windows, side by side, which a single architectural unit
Elliptical: See fanlight
Frame: An open structure or rim for encasing, holding or bordering
French: A casement window extending down to the floor; also called a French door
Grille: An ornamental arrangement of bars to form a screen or partition, usually of metal, wood, stone, or concrete, to cover, conceal, decorate, or protect an opening
Hopper: A bottom-pivoting casement window that opens by tilting vertically, typically to the inside.
"A hopper window is a single style window similar to a casement window in that they both are hinged for opening, rather than slide open. A hopper window is hinged on the bottom and opens inward from the top. Though a hopper window can come in a variety of sizes, the hopper window is a common style window in small areas and openings, such as basements and bathrooms." - Wise Geek (May 2012)
Lunette: A crescent or semicircular window or wall panel framed by an arch or vault. Commonly called a "half-moon window."
Pane: One of the divisions of a window or door, consisting of a single unit of glass set in a frame
Rail: A bar extending horizontally between supports
Ribbon - See "Band" above
Sash: Any framework of a window; may be movable or fixed; may slide in a vertical plane (as in a double-hung window) or may be pivoted (as in a casement window). The development of counterweighted vertically sliding sashes in the 1670s eliminated the need for for mullions and transoms while allowing much larger areas of glass to be moved. By 1700 sashes were common.
Sill: The horizontal bottom member of a window frame
Splayed: A window whose frame is set at an angle with respect to the face of the wall
Stained-glass window: A window whose glass is colored. Example from Karpeles Manuscript Museum
Stile: One of the upright structural members of a window frame, at the outer edge
Surround: An encircling border or decorative frame
Treble sash: A window having three vertically sliding sashes, one above the other; each of which closes a different part of the window; occasionally found in America in the late 18th and early 19th centuries in large houses having very high ceilings. Compare with three-part window
Triangular: Window shaped like a triangle
Tripart / triple / three-part window: A window having a wide rectangular sash at its center and a narrower sash on each side; all three sashes are of the same height and are in the same plane; essentially a Palladian window with the rounded head of the center sash lopped off at the top Found in many Greek Revival style homes, this type of window was introduced in America in about 1785. Compare with treble sash and Chicago window
Twin lancet windows under pointed arch, crowned by a quatrefoil: lancet window ... quatrefoil