lubricant

from WordNet (r) 3.0 (2006)

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

from The Collaborative International Dictionary of English v.0.48

Lubricant \Lu"bri*cant\, a. [L. lubricans, p. pr. of lubricare,
   See {Lubricate}.]
   Lubricating.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Lubricant \Lu"bri*cant\, n.
   That which lubricates; specifically, a substance, as oil,
   grease, graphite, etc., used for reducing the friction of the
   working parts of machinery.
   [1913 Webster]

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