from
The Collaborative International Dictionary of English v.0.48
Sonometer \So*nom"e*ter\, 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]