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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
1735-45; tap1 + -et Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for tappet
Historical Examples
  • 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
  • As the tappet is struck 400 to 600 times per minute, the wear and stress is great.

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

  • 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
  • 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
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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