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[tap-it] /ˈtæp ɪt/
noun, Machinery.
a sliding rod, intermittently struck by a cam, for moving another part, as a valve.
Origin of tappet
First recorded in 1735-45; tap1 + -et Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for tappet
Historical Examples
  • As the tappet is struck 400 to 600 times per minute, the wear and stress is great.

    Expository Writing Mervin James Curl
  • In these grooves slides a tappet, n, connected with the axle.

  • Each stamp has a tappet at the back, which requires to be daubed with grease on the lower side that it can be raised more easily.

    De Re Metallica Georgius Agricola
  • When the exhaust valve is operated by the tappet rod and rocker arm the intake valve is also carried down with it.

    Aviation Engines

    Victor Wilfred Pag
  • By an ingenious rocker arm and tappet rod arrangement it is possible to operate both valves with a single push rod.

    Aviation Engines

    Victor Wilfred Pag
  • The resistance and pressure of the tappet tends to throw increased and unequal wear on the opposite side of the cylinder.

    Expository Writing Mervin James Curl
  • After going over my engine, I found that a tappet rod had broken and stripped the cowling.

    Sixty Squadron R.A.F. Group-Captain A. J. L. Scott
British Dictionary definitions for tappet


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
Word Origin
C18: from tap1 + -et
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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