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1. The process or operation of cutting spiral grooves in a rifle barrel.
2. Grooves cut in a rifle barrel.
1. (Firearms, Gunnery, Ordnance & Artillery) the cutting of spiral grooves on the inside of a firearm's barrel
2. (Firearms, Gunnery, Ordnance & Artillery) the series of grooves so cut
1. the cutting of spiral grooves in a gun barrel, pipe, etc.
2. the system of grooves so cut.