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tappetmachine part, 1745, apparently from tap (v.1) + -et, "but the use of the suffix is abnormal" [OED].
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2 |
tappet(n) a lever that is moved in order to tap something else
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3 |
tappetA pivoting actuator that opens and closes cylinder intake and exhaust valves.
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4 |
tappet
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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