Tappet meaning

tăp'ĭt
A lever or projecting arm that moves or is moved by contact with another part, usually to transmit motion, as between a driving mechanism and a valve.
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A sliding rod in an engine or machine moved by intermittent contact with a cam and used to move another part, as a valve.
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A lever or projection which is moved by some other piece, as a cam, or intended to tap or touch something else, in order to produce change or regulate motion.
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Origin of tappet

From tap +"Ž -et, possibly influenced by homophony with "tap it."