noun
bur
A rotating cutting tool used in dentistry or machining.
The dentist fits a small cutting bur into the handpiece.
Etymology
The older word names a prickly seed case. The cutting tool borrows that image for its toothed or rough working surface, which removes material as it rotates.
More examples
- A rotating bur removed the damaged material.
- The machinist chose a bur with fine cutting teeth.
- The worn bur was replaced before the next procedure.
Forms
bur · burs
Similar words
- drill bit
- Usually cuts a hole along its axis, while burs can shape or grind surfaces.