A jamb is a post that forms the side part or upright of a door frame or window frame. a post that forms the side of a door or window (jambe , from gamba)
The top and two sides of a door or window frame which contact the door or sash; top jamb and side jambs
The main vertical members forming the sides of a window or door frame Jamb Liner A weather-strip device which, in double hung windows, lines the two vertical sides of the sash opening In addition to providing a tight fit between sashes and the frame it also serves as a mounting site for the block and tackle and coiled spring operating mechanism
A vertical member at the side of the window frame Can also refer to the horizontal member at the top of a window frame, as in Head Jamb and Window Jamb