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2 definitions found
 for tractor-trailer
From The Collaborative International Dictionary of English v.0.48 :

  Tractor-trailer \Tract"o*r-trail"er\, n.
     a combination of a tractor[4] hooked up to a trailer, forming
     a common type of truck[7] used for carrying freight on
     highways. "Traffic was backed up for miles by a jackknifed
     tractor-trailer."
     [PJC]

From The Collaborative International Dictionary of English v.0.48 :

  Truck \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.
        [1913 Webster]
  
     2. A low, wheeled vehicle or barrow for carrying goods,
        stone, and other heavy articles.
        [1913 Webster]
  
              Goods were conveyed about the town almost
              exclusively in trucks drawn by dogs.  --Macaulay.
        [1913 Webster]
  
     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.
        [1913 Webster]
  
     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.
            [1913 Webster]
  
     5. A freight car. [Eng.]
        [1913 Webster]
  
     6. A frame on low wheels or rollers; -- used for various
        purposes, as for a movable support for heavy bodies.
        [1913 Webster]
  
     7. a motorized vehicle larger than an automobile with a
        compartment in front for the driver, behind which is a
        separate compartment for freight; esp.
        (a) such a vehicle with an inflexible body.
        (b) A vehicle with a short body and a support for
            attaching a trailer; -- also called a tractor[4].
        (c) the combination of tractor and trailer, also called a
            tractor-trailer (a form of articulated vehicle); it
            is a common form of truck, and is used primarily for
            hauling freight on a highway.
        (d) a tractor with more than one trailer attached in a
            series. In Australia, often referred to as a road
            train.
            [PJC]

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