cannelure

noun
can·​ne·​lure | \ ˈkanᵊlˌ(y)u̇(ə)r\
variants: or channelure \ ˈcha-​ \
plural -s

Definition of cannelure

1 : a groove running lengthwise on the surface of a cylinder or column
2a : a groove around the cylinder of an elongated bullet for small arms to contain a lubricant
b : a groove around a bullet into which the edge of the cartridge case is crimped
c : a groove around the rotating band of a gun projectile to lessen the resistance offered to the rifling
d : a groove around the base of a cartridge where the extractor takes hold

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History and Etymology for cannelure

French cannelure, alteration of Middle French cannelature, from Old Italian cannellatura, probably from cannella small tube, cinnamon, from Medieval Latin canella

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