resonator

[rez-uh-ney-ter]
noun
  1. anything that resonates.
  2. an appliance for increasing sound by resonance.
  3. an instrument for detecting the presence of a particular frequency by means of resonance.
  4. Electronics.
    1. a hollow enclosure (cavity resonator) made of conducting material of such dimensions that electromagnetic radiation of a certain frequency will resonate.
    2. any circuit having this frequency characteristic.

Origin of resonator

First recorded in 1865–70; resonate + -or2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for resonator

resonator

noun
  1. any body or system that displays resonance, esp a tuned electrical circuit or a conducting cavity in which microwaves are generated by a resonant current
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for resonator
n.

instrument or chamber formed to respond to a single tone, 1869, agent noun in Latin form from resonate (v.).

Online Etymology Dictionary, © 2010 Douglas Harper