noun
jamb
JAM/dʒæm/
A vertical side piece of a door or window frame.
The vertical jamb forms one side of the wooden doorframe.

Etymology
The idea of bending at a joint led to a word for a leg. A door or window’s upright side post was then pictured as its leg.
In context
when we put this on the jamb when i mortise this side into the door jamb i'm not gonna have any gap between the door and the jamb
More examples
- The door hinges attach to the jamb with long screws.
- Water has damaged the wooden jamb beside the window.
- Measure the distance between the two jambs before ordering a door.
Forms
jamb · jambs