D defs.my
Entry 1 sense Webster, 1913

clapperboard

/(klăp"pẽr*bōrd`)/ · clap·per·board · IPA
01 n. a device which synchronizes sound and picture while making a motion picture, consisting of boards held in front of a movie camera, which ar…
  1. 1.
    a device which synchronizes sound and picture while making a motion picture, consisting of boards held in front of a movie camera, which are are banged together.