JAMB

jamb. Jamb, n. the upright post of a door, a supporter

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Jamb (?), n. [[Prov. E. jaumb, jaum, F. jambe a leg, jambe de force a principal rafter. See Gambol.]] 1. 1. (Arch) 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. Gwilt.
2. 2. (Mining) Any thick mass of rock which prevents miners from following the lode or vein.