rockshaft

[ rok-shaft, -shahft ]

noun

, Machinery.

1. an oscillating 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

Word History and Origins

Origin of rockshaft¹

First recorded in 1870–75; rock ² + shaft