A small wheel, as of a vehicle; specifically (Ord.), a small strong wheel, as of wood or iron, for a gun carriage.
A low, wheeled vehicle or barrow for carrying goods, stone, and other heavy articles.
A swiveling carriage, consisting of a frame with one or more pairs of wheels and the necessary boxes, springs, etc., to carry and guide one end of a locomotive or a car; -- sometimes called bogie in England. Trucks usually have four or six wheels.