n. [ L. sonus a sound + -meter. ] 1. (Physiol.) 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. [ 1913 Webster ]

2. An instrument for testing the hearing capacity. [ 1913 Webster ]

n. [ Gr. "odo`metron, "odo`metros, an instrument for measuring distance; "odo`s way + me`tron measure: cf. F. odométre, hodométre. See also hodometer.] An instrument attached to a vehicle or connected, as by a flexible cable, to the wheel of a vehicle, which measures the distance traversed. [1913 Webster]

2. A hodometer. [1913 Webster +PJC]