gearwheel

or gear wheel

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

noun

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

Origin of gearwheel

First recorded in 1870–75; gear + wheel
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for gearwheel

gearwheel

/ (ˈɡɪəˌwiːl) /

noun

another name for gear (def. 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012