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radio galaxy a galaxy that emits a large amount of radio energy.
radiogram a message transmitted using radio signals or wireless telegraph. [2 definitions]
radiograph an image produced by the action of x-rays or other forms of radiation on a photographic film; autoradiogram; radiogram. [2 definitions]
radioisotope an unstable isotope that emits subatomic particles or energy in decaying to a more stable state.
radiolarian any small marine protozoan having an amoebalike body encased in a silica skeleton.
radiology the branch of medicine dealing with the examination of bones and internal organs using imaging techniques such as x-rays, ultrasound, and magnetic resonance. [2 definitions]
radiolucent showing little or no resistance to x-rays or other forms of radiant energy.
radioman one who operates or repairs radio equipment.
radiometer an instrument for measuring radiant energy or transforming radiant energy into mechanical energy, consisting of vertical vanes that absorb more heat on one side than the other, so that they rotate around an axis when irradiated.
radiopaque of a substance, resistant to penetration by radiation such as x-rays or gamma rays.
radiophone a telephone whose sound is transmitted by radio waves; radiotelephone.
radiophoto radiophotograph.
radiophotograph a photograph or other visual image transmitted by radio.
radioscopy the internal examination of opaque objects by means of radiation such as x-rays.
radiosensitive sensitive or susceptible to destruction by radiant energy, as living organisms or tissue.
radiosonde an airborne meteorological instrument that radios information about air temperature, pressure, and humidity to ground stations; radiometeorograph.
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]
radiotelegraph a telegraph in which signals are transmitted by radio rather than by wires.
radiotelegraphy the design, construction, or operation of telegraphs whose signals are transmitted by radio waves.
radiotelephone a telephone whose sound is transmitted by radio waves; radiophone.