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Noun: drilling fluid  'dri-ling'floo-id
  1. 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
    - drilling mud

Derived forms: drilling fluids

Type of: lube, lubricant, lubricating substance, lubricator

Encyclopedia: Drilling fluid