resonator

/ˈrɛzəˌneɪtər/
noun
  1. A device or object that amplifies or produces sound by vibrating at a specific frequency.
    • In a tuning fork, the two prongs form a resonator that produces a clear tone.
    • The singer's chest cavity serves as a natural resonator for her voice.
    • The guitar's body acts as a resonator, making the strings sound louder.
  2. A device that responds to or generates electromagnetic waves of a particular frequency.
    • The microwave oven uses a resonator to produce the waves that heat food.
    • Engineers designed a tiny resonator for the new radio transmitter.
    • The laser contains an optical resonator that amplifies the light beam.
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