noiselessdrill
nounUK /ˈnɔɪzləs drɪl/
US /ˈnɔɪzləs drɪl/
A drill that makes very little or no sound when it works.
The dentist used a noiseless drill so the patient would not feel scared.
OTHER MEANINGS
2. A practice or exercise done without any noise.
The class did a noiseless drill of the fire escape plan.
3. A repeated action performed silently to learn a skill.
The coach taught a noiseless drill for passing the ball.
4. A tool for making holes that is designed to keep sound low.
The workshop bought a noiseless drill for late-night jobs.