radio-, radi-, rad-

(Latin: ray, radiating [the Latin word for the spokes of a wheel is radius]; spoke, staff, rod)

radioscopy
1. The examination of opaque bodies by x-rays.
2. An instrument for viewing objects using x-rays.
radiosensibility (s) (noun), radiosensibilities (pl)
Responsiveness of the body or its parts to the exposure of radiation: The doctors were pleased with the results of the radiosensibility because the large wart on Marion's elbow was diminishing in size.
radiosensitive (adjective), more radiosensitive, most radiosensitive
Relating to the reactions of cells or tissues to energy which is received in waves: There are hazards for some radiosensitive patients, depending on the dose received and the duration of such exposures to X rays or gamma rays.

Some radiosensitive tissues or organisms are easily affected by or destroyed with a stream of particles including electrons, neutrons, protons, or alpha particles.

radiosurgery
radiotelegraphy (s) (noun), radiotelegraphies (pl)
1. The use of electromagnetic waves to transmit and receive information, as in sound broadcasts or two-way communication, without the need for connecting wires.
2. Communication that takes place by means of radio waves.
3. An electronic device for receiving sound broadcasts transmitted via radio signals.
4. An electronic device used to send and receive radio signals, used for two-way communications.
5. The broadcasting by radio of programs (news, music, talk shows, etc.) for the public.
6. Radio broadcasting as an industry or profession.
radiotherapeutics
radiotherapist
radiothermy
Diathermy effected by heat from radiant sources.
radiotropism
radium
radius (s), radii (pl)
ray
1. A narrow beam of light from the Sun or an artificial light source.
2. A slight indication of something positive in a difficult or worrying situation a ray of hope.
3. A thin beam of radiant energy or particles.
4. A straight line that extends from a point infinitely in one direction.
5. An arm of a starfish or other animal with body parts radiating from the center.
6. A bright streak on the lunar surface which radiates from a crater.
7. In botany, a distinct strand of tissue running radially through the conducting tissues in the stem of a plant.
8. A fish with a cartilaginous skeleton, a horizontally flat head and body, broad pectoral fins, and a tapering tail.
9. Etymology: from Old French rai, rais, "ray, spoke"; from Latin radius, "ray, spoke, staff, rod".
Rayon (French for ray)