(physics) electromagnetic radiation consisting of gamma rays

electromagnetic radiation consisting of X-rays, radiation in the X-ray spectrum, of shorter wavelength and higher frequency than ultraviolet and longer wavelength and lower frequency than gamma rays

(idiomatic) To vanish or fall into obscurity.

Of or pertaining to radioscopy

Investigation of the upper atmosphere by use of a radiosonde.

(astronomy) Any nebula that emits radio waves

(idiomatic) Likely to happen, or be important in the near future or tending to attract attention.

Alternative spelling of horseradish

(radio) A radio specifically tuned for usage inside cars, i.e. by utilization of traffic programme and alternative frequency functions.

plural of Van Allen radiation belt