Crossword Genius

Gear tooth (3)

Ross

I believe the answer is:

cog

'gear tooth' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for cog that I've seen before include "Tooth on the rim of gear wheel" , "Each of series of teeth on wheel" , "Little gearwheel" , "bar" , "One on a gearwheel" .)

I've seen this clue in the Universal, the LA Times, The Telegraph, the King Feature Syndicate, the Penny Press, the Newsday, the Sydney Morning Herald, The New York Times and the USA Today.
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