tappet

[tap-it]
noun Machinery.
a sliding rod, intermittently struck by a cam, for moving another part, as a valve.

Origin:
1735–45; tap1 + -et

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World English Dictionary
tappet (ˈtæpɪt)
 
n
a mechanical part that reciprocates to receive or transmit intermittent motion, esp the part of an internal-combustion engine that transmits motion from the camshaft to the push rods or valves
 
[C18: from tap1 + -et]

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Tappet-hen, a crested hen-shaped bottle holding three quarts of claret.
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