Source : Webster's Revised Unabridged Dictionary (1913)

Preserver \Pre*serv"er\, n.
   1. One who, or that which, preserves, saves, or defends, from
      destruction, injury, or decay; esp., one who saves the
      life or character of another. --Shak.

   2. One who makes preserves of fruit.

   {Game preserver}. See under {Game}.

Source : WordNet®

preserver
     n 1: a skilled worker who is employed to restore or refinish
          buildings or antique furniture [syn: {refinisher}, {renovator},
           {restorer}]
     2: a cook who preserves fruits or meat
     3: someone who keeps safe from harm or danger
     4: rescue equipment consisting of a buoyant belt or jacket to
        keep a person from drowning [syn: {life preserver}, {flotation
        device}]