Gal"lop*er (?), n.
1.
One who, or that which, gallops.
2.
Mil.
A carriage on which very small guns were formerly mounted, the gun resting on the shafts, without a limber.
Farrow.
Galloper gun, a light gun, supported on a galloper, -- formerly attached to British infantry regiments.
© Webster 1913.