[ tap-it ]

  1. 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

Words Nearby tappet

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use tappet in a sentence

  • 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
  • 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
  • The oscillating of the tappet-arm produces an intermittent rotary motion of the ratchet-wheel.

  • 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

British Dictionary definitions for tappet


/ (ˈtæpɪt) /

  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

Origin of 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