rockshaft

[ rok-shaft, -shahft ]
/ ˈrɒkˌʃæft, -ˌʃɑft /

noun Machinery.

an oscillating shaft.

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Origin of rockshaft

First recorded in 1870–75; rock2 + shaft
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for rockshaft

rockshaft
/ (ˈrɒkˌʃɑːft) /

noun

a shaft that rotates backwards and forwards rather than continuously, esp one used in the valve gear of a steam 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