Jamb (noun)

1. A vertical side piece of a door, window or fireplace opening.
2. Either of the two upright posts or pieces that form the sides of a doorway, window or fireplace.

Origin:

Derived from the old french word 'jamb' meaning 'leg or pillar'. in architecture, a jamb refers to the vertical side piece of a door, window or fireplace opening.

Examples:

1. The carpenter measured the jamb to ensure that the door would fit properly.
2. The jamb was made of solid oak and was finished to match the trim.
3. The jamb of the window was decorated with intricate carvings.
4. The jamb of the fireplace was blackened from years of smoke and soot.
5. The jamb was fitted with a doorstop to protect the door and wall.