Source : Webster's Revised Unabridged Dictionary (1913)

Lum \Lum\, 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.]