\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.
{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.