The Collaborative International Dictionary of English v.0.48:

Lubricator \Lu"bri*ca`tor\, n.
   1. One who, or that which, lubricates. " Lubricator of the
      fibers." --Burke.
      [1913 Webster]

   2. A contrivance, as an oil cup, for supplying a lubricant to
      machinery.
      [1913 Webster]

WordNet (r) 3.0 (2006):

lubricator
    n 1: a substance capable of reducing friction by making surfaces
         smooth or slippery [syn: lubricant, lubricator,
         lubricating substance, lube]