TAPPET

tappet

(noun) a lever that is moved in order to tap something else

Source: WordNet® 3.1

Etymology

Noun

tappet (plural tappets)

A lever or projection which is moved by some other piece, as a cam, or intended to tap or touch something else, in order to produce change or regulate motion.

Synonyms

• follower

• lifter

Source: Wiktionary

Tap"pet, n. (Mach.)

Definition: 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. Tappet motion, a valve motion worked by tappets from a reciprocating part, without an eccentric or cam, -- used in steam pumps, etc.

Source: Webster’s Unabridged Dictionary 1913 Edition