From The Collaborative International Dictionary of English v.0.44 [gcide]:
Lubricant \Lu"bri*cant\, noun That which lubricates; specifically, a substance, as oil, grease, graphite, etc., used for reducing the friction of the working parts of machinery.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Lubricant \Lu"bri*cant\, adjective [L. lubricans, p. pr. of lubricare, See {Lubricate}.] Lubricating.
From WordNet (r) 2.0 [wn]:
noun
1: a substance capable of reducing friction by making surfaces smooth or slippery [syn: {lubricator}, {lubricating substance}]
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