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Architectural Terms

Quoin The dressed stones at the corners of buildings, usually laid so their faces are alternately large and small. Usually in contrasting colour of brick from the rest of the wall. Common feature of Georgian buildings.
Mullion A vertical member dividing a window or other opening.
Jamb A vertical post supporting a window frame or doorway.
Head The construction that comprises the entire lintel of a door or window.
Cill The horizontal ledge at the bottom of a window frame.
Transom A horizontal crossbar in a window, over a door, or between a door and a window above it. Transom is the horizontal, as mullion is the vertical, bar across an opening.
Threshold The strip directly beneath an exterior door.