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tractor

 - 4 dictionary results

trac⋅tor

[trak-ter]
–noun
1. a powerful motor-driven vehicle with large, heavy treads, used for pulling farm machinery, other vehicles, etc.
2. Also called truck tractor. a short truck with a driver's cab but no body, designed for hauling a trailer or semitrailer.
3. something used for drawing or pulling.
4. Aeronautics.
a. a propeller mounted at the front of an airplane, thus exerting a pull.
b. Also called tractor airplane. an airplane with a propeller so mounted.

Origin:
1855–60; < L trac-, var. s. of trahere to draw, pull + -tor -tor
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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trac·tor   (trāk'tər)   
n.  
  1. A vehicle having a powerful gasoline or diesel motor and usually large, heavily treaded rear tires, used especially for pulling farm implements or machinery.

  2. A truck having a cab and no body, used for pulling large vehicles such as vans or trailers.

  3. Something that pulls or draws.

    1. An airplane propeller mounted in front of the supporting surfaces.

    2. An airplane having such a propeller.

  4. A toothed mechanism that automatically advances perforated continuous-form paper through a computer printer.


[From Latin tractus, past participle of trahere, to draw.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

tractor 
1856, "something that pulls," earlier used of a quack device consisting of two metal rods which were supposed to relieve rheumatism (1798, in full Perkins's metallic tractor), from M.L. tractor, from stem of L. trahere "to pull, draw" (see tract (1)). Sense of "an engine or vehicle for pulling wagons or plows" is first recorded 1901, from earlier traction engine (1859). The meaning "powerful truck for pulling a freight trailer" is first found 1926; tractor-trailer is attested from 1949.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: trac·tor
Pronunciation: 'trak-t&r
Function: noun
: an instrument used to exert traction on a body part or tissue (as in surgicalprocedures) tractor>
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