| alpha ray |
radiation composed of alpha particles. |
| beta ray |
a stream of beta particles, esp. those with a negative charge. |
| cathode ray |
a stream of electrons emitted by a cathode in a vacuum tube. |
| cathode-ray tube |
a vacuum tube in which a stream of electrons is accelerated and focused in a beam that produces lighted traces on a screen at one end of the tube, used in television sets, computer monitors, and the like. |
| cosmic ray |
high energy radiation, consisting primarily of high-energy protons and alpha particles, that primarily originates from outside the solar system. Upon collision with earth's atmosphere, secondary particles can be produced that sometimes reach the earth's surface. |
| delta ray |
any particle emitted from matter following bombardment by ionizing radiation. |
| eagle ray |
any of a family of marine rays with a sharp, eaglelike head, able to glide very swiftly through the water. |
| electric ray |
any of various marine rays that are capable of giving off a strong electrical discharge. |
| gamma ray |
electromagnetic radiation of high energy and frequency, produced by reactions of radioactive atoms or by high energy electrons interacting with matter. |
| ray flower |
any of the flowers around the border of the head of a composite plant such as the daisy. |
| Roentgen ray |
(sometimes l.c.) see "x-ray." |
| violet ray |
light having the shortest wavelength in the visible spectrum. [2 definitions] |
| X-ray |
a beam of high-energy photons that is able to ionize gases and pass through dense solids. [5 definitions] |