Truck (?), n. [L. trochus an iron hoop, Gr. � a wheel, fr. � to run. See Trochee, and cf. Truckle, v. i.] 1. A small wheel, as of a vehicle; specifically (Ord.), a small strong wheel, as of wood or iron, for a gun carriage.
2. A low, wheeled vehicle or barrow for carrying goods, stone, and other heavy articles.
Goods were conveyed about the town almost exclusively in trucks drawn by dogs. Macaulay.
3. (Railroad Mach.) 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.
4. (Naut.) (a) A small wooden cap at the summit of a flagstaff or a masthead, having holes in it for reeving halyards through. (b) A small piece of wood, usually cylindrical or disk-shaped, used for various purposes.
5. A freight car.
6. A frame on low wheels or rollers; — used for various purposes, as for a movable support for heavy bodies.