Lum noun [ W. llumon chimney, llum that shoots up or ends in a point.] 1. A chimney. [ Prov. Eng. & Scot.] Burns. 2. A ventilating chimney over the shaft of a mine. 3. A woody valley; also, a deep pool. [ Prov. Eng.] Found on http://www.encyclo.co.uk/webster/L/68