from The Century Dictionary.

  • noun An apparatus used in experimenting upon musical strings or wires, and in illustrating the laws which govern their transverse vibrations.
  • noun An instrument, consisting of a small bell fixed on a table, for testing the effects of treatment for deafness.
  • noun In electricity, an apparatus for testing metals by means of an induction-coil, with which is associated a telephone. See induction-balance.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (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.
  • noun An instrument for testing the hearing capacity.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An audiometer.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun an instrument used to measure the sensitivity of hearing


Sorry, no etymologies found.


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  • The external neutrality that we can now produce at will is absolute, as it crosses the line of two contrary polarities, being similar to the zero of my electric sonometer, whose zero is obtained by the crossing of two opposing electric forces.

    Scientific American Supplement, No. 392, July 7, 1883 Various


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