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The Collaborative International Dictionary
Rallus scepitans

Clapper \Clap"per\, n.

  1. A person who claps.

  2. 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.

    Clapper rail (Zo["o]l.), an Americam species of rail ( Rallus scepitans).