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1. (Science: physiology) An instrument for exhibiting the transverse vibrations of cords, and ascertaining the relations between musical notes. It consists of a cord stretched by weight along a box, and divided into different lengths at pleasure by a bridge, the place of which is determined by a scale on the face of the box.

2. (Science: instrument) An instrument for testing the hearing capacity.

Origin: L. Sonus a sound.