clapper

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One who applauds.
• noun The tongue of a bell.
• noun Slang The tongue of a garrulous person.
• noun Two flat pieces of wood held between the fingers and struck together rhythmically.

from The Century Dictionary.

• noun In botany, the auricle in hepatics. See auricle, 3 .
• noun Something which claps or strikes with a loud, sharp noise.
• noun The cover of a clack-dish.
• noun The piece of wood or metal which strikes the hopper of a mill.
• noun 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.
• noun A clack or windmill for frightening birds.
• noun plural Pieces of wood or bone to be held between the fingers and struck together rhythmically; the bones.
• noun The knocker of a door.
• noun One who claps, especially one who applauds by clapping the hands.
• noun A clack-valve.
• noun plural A pair of iron plates used to hold fine steel springs while being hardened.
• noun A plank laid across a running stream as a substitute for a bridge.
• noun plural Warrenpales or -walls.
• noun The tongue.
• To clap; make a clattering noise.
• noun See claper.

from the GNU version of the Collaborative International Dictionary of English.

• noun obsolete A rabbit burrow.
• noun A person who claps.
• noun That which strikes or claps, as the tongue of a bell, or the piece of wood that strikes a mill hopper, etc. See Illust. of Bell.
• noun (Zoöl.) an Americam species of rail (Rallus scepitans).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete A rabbit burrow.
• noun An object so suspended inside a bell that it may hit the bell and cause it to ring.
• noun A wooden mechanical device used as a scarecrow; bird-scaring rattle, a wind-rattle or a wind-clapper.
• verb transitive To ring a bell by pulling a rope attached to the clapper.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who applauds
• noun metal striker that hangs inside a bell and makes a sound by hitting the side
• noun a mobile mass of muscular tissue covered with mucous membrane and located in the oral cavity