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tappet

Syllabification: tap·pet
Pronunciation: /ˈtapit
 
/

Definition of tappet in English:

noun

A lever or projecting part on a machine that intermittently makes contact with a cam or other part so as to give or receive motion.
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.

Definition of tappet in:

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Pronunciation: vɪˈdʒɛsɪm(ə)l
adjective
relating to or based on the number twenty