The Collaborative International Dictionary of English v.0.48:

Treasurer \Treas"ur*er\, n. [OE. tresourer, F. tr['e]sorier.]
   One who has the care of a treasure or treasure or treasury;
   an officer who receives the public money arising from taxes
   and duties, or other sources of revenue, takes charge of the
   same, and disburses it upon orders made by the proper
   authority; one who has charge of collected funds; as, the
   treasurer of a society or corporation.
   [1913 Webster]

   Lord high treasurer of England, formerly, the third great
      officer of the crown. His office is now executed by five
      persons styled the lords commissioners of the treasury, or
      treasury lords.
      [1913 Webster]