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rocker arm

noun, Machinery.
a rocking or oscillating arm or lever rotating with a moving shaft or pivoted on a stationary shaft.
Origin of rocker arm
1855-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for rocker-arm

rocker arm

a lever that rocks about a pivot, esp a lever in an internal-combustion engine that transmits the motion of a pushrod or cam to a valve
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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