noun.
A device that lubricates, that applies lubricant.
noun.
A person employed to lubricate.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a substance capable of reducing friction by making surfaces smooth or slippery
Word Usage
"The "lubricator" now being used on nearly all the railroad engines in the United States was invented by a colored man, Mr.E. McCoy, of Detroit, Michigan."