Doorjamb (noun)

1. The vertical framing on either side of a door opening, which helps support the structure of the doorway and secures the door in place.
2. A piece of molding or trim surrounding a door opening.

Origin:

The word 'doorjamb' originated in the late 16th century from the middle french 'jambier' meaning 'to support with a jamb', which refers to the upright post on either side of a doorway.

Examples:

1. The carpenter measured the doorjamb to ensure the new door would fit properly.
2. The doorjamb was damaged in the break-in, so the door couldn't be closed.
3. The doorjamb was decorated with elaborate carving and molding.
4. The doorjamb was reinforced with a metal plate for added security.
5. The doorjamb was painted to match the trim and give the doorway a finished look.