jamb

One of a pair of vertical posts or pieces that together form the sides of a door, window frame, or fireplace, for example.

A projecting mass or columnar part.

An obsolete spelling of jam.

A leg.

The side or cheek of a helmet or shield.

In architecture, a side or vertical piece of any opening or aperture in a wall, such as a door, window, or chimney, which helps to bear the lintel or other member overhead serving to sustain or discharge the superincumbent weight of the wall.

In mining, a mass of mineral or stone in a quarry or pit standing upright, and more or less distinct from neighboring or adjoining parts. Also spelled jam.

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.

Any thick mass of rock which prevents miners from following the lode or vein.

See jam, v. t. & i.