gearwheel

[geer-hweel, -weel] /ˈgɪərˌʰwil, -ˌwil/

noun

a wheel having teeth or cogs that engage with those of another wheel or part; cogwheel.

Also, gear wheel.

Origin

1870-75; gear + wheel

British Dictionary definitions for gearwheel

/ˈɡɪəˌwiːl/

noun

another name for gear (sense 1)