noun
sound box; sounding box
Refers to the hollow body of a stringed instrument that amplifies sound through resonance.
バイオリンの共鳴胴は、音を大きくする役割がある。
The violin's sound box serves to amplify the sound.
Compound of 共鳴 (resonance) and 胴 (body, trunk), referring to the resonating body of an instrument.