Can"ne*lure (kăn"n&esl;*l&usl;r), n. [F., fr. canneler to groove.] (Mil.) A groove in any cylinder; specif., a groove around the cylinder of an elongated bullet for small arms to contain a lubricant, or around the rotating band of a gun projectile to lessen the resistance offered to the rifling. Also, a groove around the base of a cartridge, where the extractor takes hold. -- Can"ne*lured (#), a.

Can"ne*lure (kăn"n&esl;*l&usl;r), n. [F., fr. canneler to groove.] (Mil.) A groove in any cylinder; specif., a groove around the cylinder of an elongated bullet for small arms to contain a lubricant, or around the rotating band of a gun projectile to lessen the resistance offered to the rifling. Also, a groove around the base of a cartridge, where the extractor takes hold. -- Can"ne*lured (#), a.

• Ringlike groove in the jacket of a bullet which provides a means of securely crimping the cartridge case to the bullet; analogous to the crimping groove in artillery ammunition.
  
• Ringlike groove for locking the jacket of an armor piercing bullet to the core.
  
• Ringlike groove in the rotating band of a gun projectile to lessen the resistance offered to the gun rifling.
  
• Groove around the base of a cartridge case where the extractor takes hold.
  
• Ringlike groove cut into the outside surface of a watercooled machinegun barrel into which packing is placed to prevent the escape of water from the breech end of the water jacket; cannelure cut.