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rockshaft

[rok-shaft, -shahft] /ˈrɒkˌʃæft, -ˌʃɑft/
noun, Machinery
1.
an oscillating shaft.
Origin
1870-1875
1870-75; rock2 + shaft
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rock shaft

rockshaft

/ˈrɒkˌʃɑːft/
noun
1.
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
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10
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