n. A leg.n. The side or cheek of a helmet or shield.n. 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.n. 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.An obsolete spelling of jam.