1. A drill for penetrating rock
   - bore bit, borer, stone drill

Derived forms: rock drills

Type of: drill

• nitrogen cycle
• nitrogen dioxide
• nitrogen fixation
• nitrogen mustard
• nitrogen narcosis
• nitrogen oxide
• nitrogen trichloride
• nitrogen-bearing
• nitrogen-fixing
• nitrogenase
• nitrogenise
• nitrogenize
• nitrogenous
• nitroglycerin
• nitroglycerine
• nitrohydrochloric acid
• nitrosobacteria
• Nitrosomonas
• Nitrospan
• Nitrostat
• nitrous
• nitrous acid
• nitrous bacteria
• nitrous bacterium
• nitrous oxide