Of or pertaining to radiation, radioactivity or nuclear weapons.

radiation, radioactive / radio (broadcasting) / (anatomy) radius (bone) / (geometry) radius

the transmission of sound (in both directions) using modulated radio waves rather than wires

Any of various radical social or political movements that aim at fundamental change in the structure of society

plural of radio frequency

Of or pertaining to electromagnetic radiation in the radio frequency band of the spectrum.

(uncountable) That part of the electromagnetic spectrum, between about 3 kHz and 300 MHz, within which radio waves are transmitted. / (countable) A frequency in this range.

(physics) Any of several processes by which unstable nuclei emit subatomic particles and/or ionizing radiation and disintegrate into one or more smaller nuclei.

plural of radio beacon

(communication, aviation, nautical, navigation) A beacon that emits radio wave signals to guide ships or aircraft or to indicate the position of a ship, aircraft, or other object, person, or vehicle.