Illustrated Architecture Dictionary
One of a pair of vertical posts or pieces that together form the sides of a door, window frame, or fireplace
Jamb reveal: the part of the jamb of a window or door opening between the outer wall surface and the window or door frame.
Examples from Buffalo architecture:
- Illustration above: Window jamb : Hull House
- Fireplace jambs: General Electric Tower / Niagara Mohawk Building
- Fireplace jambs: Herbert W. Turk House