Source : Webster's Revised Unabridged Dictionary (1913)

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

   2. A contrivance, as an oil cup, for supplying a lubricant to
      machinery.

Source : WordNet®

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