The Collaborative International Dictionary of English v.0.48:
Rising \Ris"ing\, n. 1. The act of one who, or that which, rises (in any sense). [1913 Webster] 2. That which rises; a tumor; a boil. --Lev. xiii. 10. [1913 Webster] Rising main (Waterworks), the pipe through which water from an engine is delivered to an elevated reservoir. [1913 Webster]