(physics) a hypothetical wave, produced by an accelerating mass, that would be propagated at the speed of light

An oscilloscope used as the viewing screen of a radar system.

examination of objects by the use of X-rays; radiology

Synonym of radiation sickness

(medicine, pathology) Any illness produced by ionizing radiation with symptoms ranging from nausea to death.

The quality of being radiant, shining, bright or splendid. / (physics) The flux of radiation emitted per unit solid angle in a given direction by a unit area of a source.

(colloquial) The hobby of amateur radio communication.

The hobby or pastime of communicating by two-way radio, often striving for “DX” QSOs that are challenging because of distance.

(medicine) The specialty of medical imaging and its interpretation, originally and especially radiography but now including all imaging modalities, including ones that use no radiation (such as ultrasonography and magnetic resonance imaging).

a ball bearing in a bearing race that has been shaped so that a radial load passes radially through the bearing