Res″o‐na′tor (?), n. Anything that resounds or resonates; specif.: (a) (Teleg.) An open box for containing a sounder and designed to concentrate and amplify the sound. (b) (Elec.) Any of various apparatus for exhibiting or utilizing the effects of resonance in connection with open circuits, as a device having an oscillating circuit which includes a helix of bare copper wire, a variable number of coils of which can be connected in circuit with a condenser and spark gap excited with an induction coil. It is used to create high-frequency electric brush discharges. (c) (Wireless Teleg.) The antenna system and other high-frequency circuits of a receiving apparatus.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.