The Collaborative International Dictionary of English v.0.48:

Dissolver \Dis*solv"er\, n.
   One who, or that which, has power to dissolve or dissipate.
   [1913 Webster]

         Thou kind dissolver of encroaching care. --Otway.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dissolver
    n 1: a liquid substance capable of dissolving other substances;
         "the solvent does not change its state in forming a
         solution" [syn: solvent, dissolvent, dissolver,
         dissolving agent, resolvent]