Definition of jamb in US English:



  • 1A side post or surface of a doorway, window, or fireplace.

    ‘he leaned against the door jamb’
    • ‘In addition to that, door seal kits include high-grade neoprene door jambs for the vertical sides and the top of the door.’
    • ‘If the door still does not seal tightly to all sides of the jamb you either installed the weatherstripping badly or the door is bent and in need of replacement.’
    • ‘The widths of original door and window jambs were calculated to fit the existing wall, and the addition of the new paneling makes the wall thicker by 1/4 ‘or more.’’
    • ‘Extend window and door jambs as needed so they will be flush with the face of the new paneling.’
    • ‘Salvaged doors and windows housed in new jambs set up contrasts between new and old.’
    post, doorpost, upright, frame, pillar
    View synonyms
    1. 1.1 A columnar mass or pillar in a mine or quarry.


Middle English: from Old French jambe ‘leg, vertical support’, based on Greek kampē ‘joint’.