Jamb
What is a doorjamb? This frame surrounds a door and gives it all the support it needs
The jamb consists of the two wood, fiberglass or metal vertical members that create the frame for a door. One side holds the hinges, the other has a recess that holds the strike plate and locking mechanism, or latch.
Because this doorway has no trim, the doorjamb is easily visible. It is the wood that lines the door opening.
This unique door has the doorjamb in the same place as always, with hinges on one side and the recess where the bolt will rest when the door is closed on the other.
Even an arched door has a doorjamb. The curved part is not structural to the door; it is the vertical members that must be level for the door to swing properly.