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From: Webster's Revised Unabridged Dictionary (1913)

 Tap·pet n. Mach. A lever or projection moved by some other piece, as a cam, or intended to tap or touch something else, with a view to produce change or regulate motion.
 Tappet motion, a valve motion worked by tappets from a reciprocating part, without an eccentric or cam, -- used in steam pumps, etc.
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