Jamb /(?)/

Jamb

n.
  1. The vertical side of any opening, as a door or fireplace; hence, less properly, any narrow vertical surface of wall, as the of a chimney-breast or of a pier, as distinguished from its face. (Arch)
  2. Any thick mass of rock which prevents miners from following the lode or vein. (Mining)

Jamb

v. t.
  1. See Jam, v. t. & i.

Jamb

n.
  1. See Jambes.