Referring to the science of radiometry.

A message, like a telegram, transmitted by radio rather than wires.

An entertainment device that combined a radio and a record player or gramophone.

A radiograph

Waste containing radioactive nuclides.

A weapon, often a bomb, designed to achieve injury or contamination of a target by dispersing harmful radioisotopes.

(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