resonator

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A resonating system.
2. n. A hollow chamber or cavity with dimensions chosen to permit internal resonant oscillation of electromagnetic or acoustical waves of specific frequencies.
3. n. A resonant circuit.

Century Dictionary and Cyclopedia

1. n. An acoustical instrument used in the analysis of sounds, consisting of a chamber so formed as to respond sympathetically to some particular tone. It is used especially to detect the presence of that tone in a compound sound.
2. n. In electricity, an instrument devised by Hertz for detecting the existence of waves of electrical disturbance. It consists usually of a conductor in the form of a wire or rod bent into a circle or rectangle, leaving a short opening or break, the length of which can be regulated. The ends of the conductor are generally furnished with small brass knobs.
3. n. In electricity: A circuit the dimensions, inductance, and capacity of which are such that it is in syntonism with some similar circuit. Electric oscillations in the one will then set up oscillations of the same frequency in the other, even at a distance.
4. n. In anatomy, the parts above the larynx which act as a resonance-box in voice-production.
5. n. A general name for such musical instruments as consist essentially of a hollow body or globe, the confined air of which is thrown into vibration by blowing upon the edge of a hole in its side, while the pitch is controlled by other holes stopped by the fingers, such as the clay whistles and ocarinas found in various parts of the world.

Wiktionary

1. n. Any object or system that resonates
2. n. A hollow cavity whose dimensions are selected so as to resonate at a specific frequency
3. n. A resonant electronic circuit

GNU Webster's 1913

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

WordNet 3.0

1. n. a hollow chamber whose dimensions allow the resonant oscillation of electromagnetic or acoustic waves
2. n. an electrical circuit that combines capacitance and inductance in such a way that a periodic electric oscillation will reach maximum amplitude
3. n. any system that resonates