tappet

A lever or projecting arm that moves or is moved by contact with another part, usually to transmit motion, as between a driving mechanism and a valve.

An early English spelling of tap.

To cover with tapestry.

Carpet; tapestry; a piece of tapestry.

In medieval armor, one of the series of flexible plates hooked to the skirts of the cuirass.

In machinery, an arm, collar, lever, or cam attached to and projecting from a movable part of a machine in such manner that the motion of the machine intermittently brings it into contact with some other part to which it imparts an intermittent motion.

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.

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

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.

a lever that is moved in order to tap something else