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.-a small wooden cap at the summit of a flagstaff or a masthead, having holes in it for reeving halyards through.-a small piece of wood, usually cylindrical or disk-shaped, used for various purposes.-a freight car.-a frame on low wheels or rollers; -- used for various purposes, as for a movable support for heavy bodies.-to transport on a truck or trucks.-to exchange; to give in exchange; to barter; as, to truck knives for gold dust.-to exchange commodities; to barter; to trade; to deal.-exchange of commodities; barter.-commodities appropriate for barter, or for small trade; small commodities; esp., in the united states, garden vegetables raised for the market.-the practice of paying wages in goods instead of money; -- called also truck system.