Source : Webster's Revised Unabridged Dictionary (1913)

Rising \Ris"ing\, n.
   1. The act of one who, or that which, rises (in any sense).

   2. That which rises; a tumor; a boil. --Lev. xiii. 10.

   {Rising main} (Waterworks), the pipe through which water from
      an engine is delivered to an elevated reservoir.