ˈtapə̇t, usu -ə̇d.+V noun
( -s )
Etymology: tap (IV) + -et
1. : a lever or projection moved by some other piece (as a cam) or intended to tap or touch something else to cause a particular motion (as in forms of steam-engine or internal-combustion-engine valve gear or in a stamp battery for crushing ore)
2. Britain : a cam for moving the heddles in some forms of power loom