Resonator /(-n?`t?r)/

Res·o·na·tor

Resonator

n.
  1. Anything which resounds; specifically, a vessel in the form of a cylinder open at one end, or a hollow ball of brass with two apertures, so contrived as to greatly intensify a musical tone by its resonance. It is used for the study and analysis of complex sounds. (Acoustics)
  2. Anything that resounds or resonates; (Teleg.)