Rifling \Ri"fling\, n.
(a) The act or process of making the grooves in a rifled
cannon or gun barrel.
(b) The system of grooves in a rifled gun barrel or cannon.
[1913 Webster]
{Shunt rifling}, rifling for cannon, in which one side of the
groove is made deeper than the other, to facilitate
loading with shot having projections which enter by the
deeper part of the grooves.
[1913 Webster]