\Res"o*na`tor\, n. [NL. & G.]
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.

\Res"o*na`tor\ (-n?`t?r), n. (Acoustics)
Anything which resounds; specifically, a vessel in the form
of a cylinder open at one end, or a hollow ball of brass with
two apertures, so contrived as to greatly intensify a musical
tone by its resonance. It is used for the study and analysis
of complex sounds.