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resonator (n.)

1869, instrument or chamber formed to respond to a single tone, agent noun in Latin form from resonate (v.). By 1897 in the general sense of "object which resonates." A resonator guitar (by 1943; the thing itself developed from 1920s) produces sound by means of spun metal cones (resonators). 

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Definitions of resonator from WordNet

resonator (n.)
a hollow chamber whose dimensions allow the resonant oscillation of electromagnetic or acoustic waves;
Synonyms: cavity resonator / resonating chamber
resonator (n.)
an electrical circuit that combines capacitance and inductance in such a way that a periodic electric oscillation will reach maximum amplitude;
Synonyms: resonant circuit
resonator (n.)
any system that resonates;
From wordnet.princeton.edu