The Collaborative International Dictionary of English v.0.48:

Liquidator \Liq"ui*da`tor\ (l[i^]k"w[i^]*d[=a]`t[~e]r), n. [Cf.
   F. liquidateur.]
   1. One who, or that which, liquidates.
      [1913 Webster]

   2. An officer appointed to conduct the winding up of a
      company, to bring and defend actions and suits in its
      name, and to do all necessary acts on behalf of the
      company. [Eng.] --Mozley & W.
      [1913 Webster]

WordNet (r) 3.0 (2006):

liquidator
    n 1: a criminal who commits homicide (who performs the unlawful
         premeditated killing of another human being) [syn:
         murderer, liquidator, manslayer]
    2: (law) a person (usually appointed by a court of law) who
       liquidates assets or preserves them for the benefit of
       affected parties [syn: liquidator, receiver]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "liquidator":
   accountant, auditor, bookkeeper, bursar, cashier, cashkeeper,
   chamberlain, compensator, comptroller, controller, curator,
   defrayer, depositary, depository, financial officer, payer,
   paymaster, purse bearer, purser, ratepayer, receiver, recompenser,
   remunerator, steward, taxpayer, treasurer, trustee