n. Something which claps or strikes with a loud, sharp noise.n. The cover of a clack-dish.n. The piece of wood or metal which strikes the hopper of a mill.n. In medieval churches, a wooden rattle used as a summons to prayers on the last three days of Holy Week, when it was customary for the church bells to remain silent. Also called clap.n. A clack or windmill for frightening birds.n. plural Pieces of wood or bone to be held between the fingers and struck together rhythmically; the bones.n. The knocker of a door.n. One who claps, especially one who applauds by clapping the hands.n. A clack-valve.n. plural A pair of iron plates used to hold fine steel springs while being hardened.n. A plank laid across a running stream as a substitute for a bridge.n. plural Warrenpales or -walls.n. The tongue.To clap; make a clattering noise.n. See claper.n. In botany, the auricle in hepatics. See auricle, 3 .