• WordNet 3.6
    • n cogwheel a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
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Webster's Revised Unabridged Dictionary
  • Interesting fact: An artificial hand , with fingers moved by cogwheels and levers, was designed in 1551 by Frenchman Ambroise ParĂ©. It worked so well that a handless cavalryman was able to grasp the reins of his horse.
    • n Cogwheel A wheel with cogs or teeth; a gear wheel. See Illust. of Gearing.
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Century Dictionary and Cyclopedia
    • n cogwheel A wheel having teeth or cogs, used in transmitting motion by engaging the cogs of another similar wheel or of a rack; a geared wheel, or a gear. The direction of the transmitted motion is determined by the position and angle of the circle of cogs. Cog-wheels include rag- or sprocket- and lantern-wheels, and are classified as spur-, bevel-, and crown-wheels, according to the position of the cogs. See these words.
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In literature:

There are some, less lucky than we, who are already caught in the cogwheels of fatigue.
"Under Fire" by Henri Barbusse
Remove washer on the short end of shaft, also the cogwheel if the shaft has cogs on both ends.
"Burroughs' Encyclopaedia of Astounding Facts and Useful Information, 1889" by Barkham Burroughs
Cogwheels are modifications of the wheel and axle.
"General Science" by Bertha M. Clark
They have very powerful engines and a cogwheel arrangement, the line making a zigzag up the mountain-side.
"Round About the Carpathians" by Andrew F. Crosse
Deserve well of us, and prosper under the Sun and Cogwheel.
"A Slave is a Slave" by Henry Beam Piper
The power ran through his throat like cogwheels out of gear.
"The Wit and Humor of America, Volume IX (of X)" by Various
There was a grinding crash, and a large cogwheel tore its way through the roof.
"The Escape of a Princess Pat" by George Pearson
Why should I thus introduce foreign matter into the delicate cogwheels of my programme of reading?
"When Winter Comes to Main Street" by Grant Martin Overton
Babbage's cogwheels and pinions calculated logarithms, calculated an eclipse.
"Stories by American Authors, Volume 10" by Various
But it will be the test-tube and not the cogwheel that will make the money.
"The Scrap Book, Volume 1, No. 3" by Various
It is to be narrow gauge, without cogwheels, and will cross the Visp torrent five times.
"The Little Gleaner, Vol. X." by Various
Ordinary light brass cogwheels will not stand the strain.
"The Theory and Practice of Model Aeroplaning" by V. E. Johnson

In news:

I was riding on Europe's highest-altitude railway in a red cogwheel train that had moved past pine forests and rolling farmlands into a majestic mountain range.