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  1. drilling pipe a series of tubes (joined by screwed collars) that connect a drilling platform to the drilling bit; rotates the bit and supplies drilling mud
  2. drilling bit a bit used in drilling for oil
  3. drilling rig rig used in drilling for oil or gas
  4. darling pea either of two Australian plants of the genus Swainsona that are poisonous to sheep
  5. rolling paper a strong tissue paper that burns evenly and is sufficiently porous to control the burning of the tobacco in a cigarette
  6. rolling pin utensil consisting of a cylinder with a handle at each end
  7. drilling mud a mixture of clays and chemicals and water
  8. drilling the act of drilling
  9. drainpipe a pipe through which liquid is carried away
  10. drawing paper paper that is specially prepared for use in drafting
  11. tracing paper a semitransparent paper that is used for tracing drawings
  12. Trilling United States literary critic (1905-1975)
  13. trailing edge the rear edge of an airfoil
  14. thrilling causing a surge of emotion or excitement
  15. trilingual using or knowing three languages
  16. trolling angling by drawing a baited line through the water
  17. drilling fluid a mixture of clays and chemicals and water
  18. running pop tropical American passion flower with finely dissected bracts; stems malodorous when crushed
  19. marlingspike a pointed iron hand tool that is used to separate strands of a rope or cable (as in splicing)
  20. travelling bag a portable rectangular container for carrying clothes