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; < Latin trac-, variant stem of trahere to draw, pull + -tor -tor

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Tractor is always a great word to know.
So is bezoar. Does it mean:
the offspring of a zebra and a donkey.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
tractor (ˈtræktə) [Click for IPA pronunciation guide]
 
n
1.  a motor vehicle used to pull heavy loads, esp farm machinery such as a plough or harvester. It usually has two large rear wheels with deeply treaded tyres
2.  a short motor vehicle with a powerful engine and a driver's cab, used to pull a trailer, as in an articulated lorry
3.  an aircraft with its propeller or propellers mounted in front of the engine
 
[C18: from Late Latin: one who pulls, from trahere to drag]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
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, © 2010 Douglas Harper
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Example sentences
Each system requires half a dozen or more large tractor trailer trucks to carry the radar, fuel supplies and laser.
It's not so long ago that almost everyone was still a farmer, and with a horse or mule instead of a tractor.
The park service's tractor will then take the loads and loads of the pulled plants away for disposal.
Mini flywheels in tractor trailers to handle large power spikes.
Images for Tractor
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