(1):
(n.) Anything that resounds or resonates;
(2):
(n.) 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.
(3):
(n.) An open box for containing a sounder and designed to concentrate and amplify the sound.
(4):
(n.) The antenna system and other high-frequency circuits of a receiving apparatus.
(5):
(n.) 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.