沟槽
纵向槽

Cannelure \Can"ne*lure\ (k[a^]n"n[-e]*l[-u]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.
[Webster 1913 Suppl.]