American Heritage Dictionary
(8)
Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
Small imperfections in manufactured metals, such as a cog or a gear, can be revealed that could indicate premature failure of the part.
The Spurs though will be without a main cog, as Manu Ginobili is out due to a stress fracture in his leg.— Latest Headlines - ABC 7 News
A cog was a craft larger than those usually designated ships--the cog John_, which is spoken of, had a crew of eighty-two men, and probably she carried besides a considerable number of knights and soldiers.— How Britannia Came to Rule the Waves Updated to 1900
You are a useful cog--too useful to lose Chalmers Lose?--Me Starkweather I have but to raise my hand, any time--do you understand?--any time, and you are lost.— Theft A Play In Four Acts

American Heritage Dictionary (3)
Century Dictionary (5)
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