Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Origin: From a Scandinavian language

cog

 noun
     
Related topics: Technology, Mechanical
cog [countable]
1T a wheel with small bits sticking out around the edge that fit together with the bits of another wheel as they turn in a machine
2T one of the small bits that stick out on a cog
3

a cog in the machine/wheel

someone who only has a small unimportant job in a large organization
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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