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 Sydney Morning Herald, the LA Times, the Newsday, The Telegraph, the Penny Press, The New York Times, the USA Today, the King Feature Syndicate and the Universal.
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