1. A groove or fluting, especially one of a series of parallel grooves cut into a surface for decoration or functional purposes.
Usage: Common in architecture and engineering contexts; Often used in plural form
2. A groove around the cylindrical part of a bullet or cartridge case.
Usage: Ballistics and ammunition terminology

Examples

• The classical column featured delicate cannelures running vertically along its shaft.
• The architect specified cannelures on the facade to create visual interest and shadow effects.
• The rifle bullet's cannelure helps grip the cartridge case securely.
• Decorative cannelures were carved into the wooden furniture to enhance its elegance.
• The metal rod displayed a series of fine cannelures for both aesthetic and structural purposes.