Definition of cog

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cog¹

g, kôg) KEY

NOUN:

One of a series of teeth, as on the rim of a wheel or gear, whose engagement transmits successive motive force to a corresponding wheel or gear.
A cogwheel.
A subordinate member of an organization who performs necessary but usually minor or routine functions.

ETYMOLOGY:
Middle English cogge, probably of Scandinavian origin; akin to Swedish kugg, kugge

OTHER FORMS:
cogged(Adjective)

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