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clock radio a radio with a built-in clock that can be set to turn the radio on at a given time.
quasi-stellar radio source see "quasar."
radio astronomy the study of the universe by observation and analysis of extraterrestrial radio waves.
radio beacon a stationary source of radio waves that emits a distinctive signal as a navigational aid for ships and aircraft.
radio compass a navigational aid consisting of a radio receiver that determines the transmission direction of incoming radio waves.
radio galaxy a galaxy that emits a large amount of radio energy.
radio spectrum the portion of the electromagnetic spectrum consisting of radio waves, esp. those most frequently used in radio and television broadcasting, from ten kilohertz to 300 gigahertz.
radio station an organization equipped for broadcasting radio. [2 definitions]
radio telescope a concave reflector or array of reflectors designed to collect and focus extraterrestrial radio waves for analysis.
radio wave an electromagnetic wave with a wavelength of between one millimeter and thirty thousand meters, or a frequency of between ten kilohertz and three hundred thousand megahertz.