'Tappet' definitions:
Definition of 'tappet'
From: WordNet
noun
A lever that is moved in order to tap something else
Definition of 'Tappet'
From: GCIDE
- Tappet \Tap"pet\, n. (Mach.) A lever or projection moved by some other piece, as a cam, or intended to tap or touch something else, with a view to produce change or regulate motion. --G. Francis. [1913 Webster]
- Tappet motion, a valve motion worked by tappets from a reciprocating part, without an eccentric or cam, -- used in steam pumps, etc. [1913 Webster]