tuning fork

Definitions

Electronics

  • A steel instrument with a handle and a U-shaped portion that can be made to vibrate. A vibrating tuning fork produces an essentially pure tone which can be maintained for several seconds. Used, for instance, for testing, tuning, and calibration.

Medical

  • noun a metal fork which, if hit, gives out a perfect note, used in hearing tests such as Rinne‚Äôs test
http://www.dictionarycentral.com/definition/tuning-fork.html