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Illustrated Architecture Dictionary
Jamb

One of a pair of vertical posts or pieces forming the sides of a door, window frame, or fireplace
Examples from Buffalo architecture:
- Illustration above: Window jamb : Hull House
- Fireplace jambs: General Electric Tower / Niagara Mohawk Building
- Fireplace jambs: Herbert W. Turk House
Other examples:
- Doorway jambs: Governor's Palace, Williamsburg, VA
- Window jambs: University of Virginia, Charlottesville, Virginia
- Portal jambs: Chartres Cathedral, Chartres, France
