Webster’s Revised Unabridged Dictionary · 1913
Lum
Lum (lŭm), n. [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.]