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.

2. <chemical>

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

Origin: Prov. E. Jaumb, jaum, F. Jambe a leg, jambe de force a principal rafter. See Gambol.

(01 Mar 1998)

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