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camshaft

[kam-shaft, -shahft] /ˈkæmˌʃæft, -ˌʃɑft/
noun
1.
a shaft bearing integral cams.
Origin
1875-1880
1875-80; cam + shaft
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cam shaft

camshaft

/ˈkæmˌʃɑːft/
noun
1.
a shaft having one or more cams attached to it, esp one used to operate the valves of an internal-combustion engine
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
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Encyclopedia Article for cam shaft

camshaft

in internal-combustion engines, rotating shaft with attached disks of irregular shape (the cams), which actuate the intake and exhaust valves of the cylinders. The cams and the camshaft are usually formed as a unit, with the cams set at angles so as to open and close the valves in a prescribed sequence as the cams rotate. A separate camshaft for each row of cylinders is driven by gears or chains from the crankshaft.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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