TAPPET n.
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.
TOOTH n.
hydroid. -- Tooth edge, the sensation excited in the teeth by grating sounds, and by the touch of certain substances, as keen acids. -- Tooth key, an instrument used to extract teeth by a motion resembling that of turning a key. -- Tooth net, a large fishing net anchored. [Scot.] Jamieson. -- Tooth ornament. (Arch.…