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|n.||1.||(Mus.) A thin board which propagates the sound in a piano, in a violin, and in some other musical instruments.|
|2.||A board or structure placed behind or over a pulpit or rostrum to give distinctness to a speaker's voice.|
|3.||See Sound boarding, under Sound, a noise.|
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.