SOUNDING-BOARD

Sound″ing–board′ (?), n. 1. 1. (Mus.) A thin board which propagates the sound in a piano, in a violin, and in some other musical instruments.
2. 2. A board or structure placed behind or over a pulpit or rostrum to give distinctness to a speaker's voice.
3. 3. pl. See Sound boarding, under Sound, a noise.