Jamb

(jām), n. [Prov. Eng. jaumb, jaum, Fr. jambe, a leg, jambe de force, a principal rafter, O. Fr. jambe, jame, It. gamba, O. Sp. camba, cama, a leg, jamba, a door or window-post, from Celt. cam, camb, bent, crooked, allied to Gr. καμπή, a bending, winding, bend of a limb, κάμπτειν, κάμπτειν, to bend, crook. Cf. KAM.]

1. (Arch.) The side-piece or post of a door; the side-piece of a fire-place, or any other aperture in a building. Gwilt.
2. (Mining.) A mass of mineral or stone in a quarry or pit standing upright, more or less distinct from neighboring or adjoining parts. [Prov. Eng.] Forby.