Lubricating oil

noun

Definitions

Noun
  1. 1
    An oil for lubrication of engines and other components.

    "Safety devices ensure that the engines are automatically shut down in the event of overspeed, low pressure in the lubricating oil system, low cooling-water pressure, or high cooling-water temperature."

  2. 2
    a thick fatty oil (especially one used to lubricate machinery) wordnet

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