ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: sound (III) + board
1.
a. : a thin resonant board (as the belly of a violin) so placed in an instrument as to reinforce its tones by sympathetic vibration — see violin illustration
b. : the top board of a wind-chest in an organ
2. : sounding board 1a