Definition of tappet in English:

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tappet

Pronunciation: /ˈtapɪt/

noun

A moving part in a machine which transmits motion in a straight line between a cam and another part.
Example sentences
  • The 16-valve has twin, chain-driven, overhead camshafts and hydraulic tappets, while the 8-valve format uses a single camshaft.
  • Contact between the cams and the tappets in the valve train span the mixed and boundary regions.
  • The real breakthrough in lifter design for street and moderate competition applications was the marriage of roller tappets with hydraulic lifters.

Origin

Mid 18th century: apparently an irregular diminutive of tap2.

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