Origin of tappet

First recorded in 1735–45; tap1 + -et
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for tappet

Historical Examples of tappet

  • 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

British Dictionary definitions for tappet


  1. 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 for tappet

C18: from tap 1 + -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