an apparatus that increases the resonance of a sound, especially a hollow part of a musical instrument.
a musical or scientific instrument responding to a single sound or note, used for detecting it when it occurs in combination with other sounds.
Physics a device that displays electrical resonance, especially one used for the detection of radio waves.
Physics a hollow enclosure with conducting walls capable of containing electromagnetic fields having particular frequencies of oscillation and exchanging electrical energy with them, used to detect or amplify microwaves.
resonator in other Oxford dictionaries
Definition of resonator in the US English dictionary