#lubricant__lubricator__lubricating_substance__lubricatingsubstance  a substance capable of reducing friction by making surfaces smooth or slippery
  supertype:  #material.substance__stuff  the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"
  subtype:  #drilling_mud__drilling_fluid  a mixture of clays and chemicals and water; pumped down the drill pipe to lubricate and cool the drilling bit and to to flush out the cuttings and to strengthen the sides of the hole
  subtype:  #motor_oil  oil used to lubricate the moving parts of a motor

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