Definition of jambs:
(n) :
(architecture, interior decorating, carpentry) Either of the vertical components that form the side of an opening in a wall, such as that of a door frame, window frame, or fireplace.
(n) :
(mining) Any thick mass of rock that prevents miners from following the lode or vein.
(v) :
(transitive) To fix or attach a jamb to.
(n) :
Synonym of jambeau (“piece of armor for the leg”).