D defs.my
Entry 2 senses Webster, 1913

Resonator

/(-n?`t?r)/ · Res·o·na·tor · IPA
01 n. 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…
  1. 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. 2.
    Anything that resounds or resonates;(Teleg.)