Jamb

Part of speech: noun (n.)

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. Gwilt.

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

Part of speech: verb (v.)

See Jam, v. t.