(mathematics) The number or expression whose square root or other root is being considered.

Of, pertaining to, or caused by radioactivity.

(rare) Particularly suited to radio broadcasting

(uncountable) The detection and locating of distant objects using microwave radiation; especially radar / (uncountable) The locating of an object that is fitted with a radio tag

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.