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A resonator is a device or part that vibrates (or oscillates) with waves.
Electromagnetic
A distributed parameter resonator of the distributed network type, has the capacitance, inductance and resistance which cannot be isolated into separate lumped capacitors, inductors, or resistors. The time factor of propagation of wave energy in the network is appreciable. Resonators can be of the dielectric type or magnetic type. A hollow device that uses resonance to amplify a wave is called a "cavity resonator".
Automobiles
A resonator is one part in exhaust systems that works with the muffler to reduce noise, by making sound waves "cancel each other out"*. The "exhaust note" is an important feature for many vehicle owners, so both the original manufacturers and the after-market suppliers use the resonator to enhance the sound in some way - for example, so-called "Ricers" are notorious for using resonators which aim to give an exhaust note comparable to that of a V8.
Musical instruments
Most musical instruments include resonators for the sound of the instrument. In string instruments this is the body of the instrument. In many keyboard percussion instruments, below the centre of each note is a tube, which is a cavity resonator, that is referred to simply as the resonator. The length of the tube varies according to the pitch of the note, with higher notes having shorter resonators. The tube is open at the top end and closed at the bottom end, creating a column of air which resonates when the note is struck. This adds depth and volume to the note.
In Camille Saint-Saëns Danse Macabre, a skeleton's dance is depicted by a xylophone. Since the instrument in Saint-Saëns' day did not have resonators, it is often performed with resonators removed (or covered). This makes sound of the instrument more brittle and bone-like. The vibrato effect of a vibraphone is obtained by a mechanism which opens and shuts the resonators. Also, by itself, it may be referring to the resonator guitar, dobro.
See also
External links
"Resonator"