So*nom"e*ter (?), n. [L. sonus a sound + -meter.]
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.
An instrument for testing the hearing capacity.
© Webster 1913.