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See also: Glass.
A long, narrow window with pointed head.
A short rib that runs from the one main rib of a vault to another.
In masonry construction, a lintel is a long, rectangular stone block which spans a door or window opening to support the weight of the structure above. Stone lintels are normally visible from the exterior. In wood-frame construction, such a structural member is a wooden beam usually termed a "header," and is concealed inside the wall.
A narrow opening.
An opening in roof (often with lantern over) to allow smoke to escape from central hearth.
A semicircular opening (with the flat side down) in a wall over a door, a niche, or a window.