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|Noun||1.||lubricating substance - a substance capable of reducing friction by making surfaces smooth or slippery|
substance - a particular kind or species of matter with uniform properties; "shigella is one of the most toxic substances known to man"
drilling fluid, drilling mud - a mixture of clays and chemicals and water; pumped down the drill pipe to lubricate and cool the drilling bit and to flush out the cuttings and to strengthen the sides of the hole
motor oil - oil used to lubricate the moving parts of a motor