Rock″ shaft′ (?). [Cf. Rock, v. i.] (Mach.) A shaft that oscillates on its journals, instead of revolving, — usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; — called also rocker, rocking shaft, and way shaft.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.