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Radiation   /rˌeɪdiˈeɪʃən/   Listen
Radiation

noun
1.
Energy that is radiated or transmitted in the form of rays or waves or particles.
2.
The act of spreading outward from a central source.
3.
Syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours.  Synonyms: radiation sickness, radiation syndrome.
4.
The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay.  Synonym: radioactivity.
5.
The spread of a group of organisms into new habitats.
6.
A radial arrangement of nerve fibers connecting different parts of the brain.
7.
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance.  Synonyms: actinotherapy, irradiation, radiation therapy, radiotherapy.



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"Radiation" Quotes from Famous Books



... the ascent was soon rested away, and our glorious morning in the sky promised nothing but enjoyment. At 9 a.m. the dry thermometer stood at 34 degrees in the shade and rose steadily until at 1 p.m. it stood at 50 degrees, probably influenced somewhat by radiation from the sun-warmed cliffs. A common bumblebee, not at all benumbed, zigzagged vigorously about our heads for a few moments, as if unconscious of the fact that the nearest honey flower was ...
— Steep Trails • John Muir

... with vexation, Thought he could defy the nation. He shot for space with great elation— Now he's dust and radiation. ...
— By Proxy • Gordon Randall Garrett

... says, "exists on account of matter having been radiated, at its origin, atomically, into a limited sphere of space, from one, individual, unconditional irrelative, and absolute Particle Proper, by the sole process in which it was possible to satisfy, at the same time, the two conditions, radiation and equable distribution throughout the sphere—that is to say, by a force varying in direct proportion with the squares of the distances between the radiated atoms, respectively, and the particular center ...
— International Miscellany of Literature, Art and Science, Vol. 1, - No. 3, Oct. 1, 1850 • Various

... should be applied as closely as possibly to the milk to be cooled, for the larger part of the chilling value of ice comes from the melting of the same. To convert a pound of ice at 32 deg. F. into a pound of water at the same temperature, if we disregard radiation, would require as much heat as would suffice to raise 142 pounds of water one degree F., or one pound of water 142 deg. F. The absorptive capacity of milk for heat (specific heat) is not quite the same as it is with water, being ...
— Outlines of Dairy Bacteriology, 8th edition - A Concise Manual for the Use of Students in Dairying • H. L. Russell

... with fresh supplies of fuel. In modern times, a much more convenient and economical mode is adopted to produce the requisite illumination. A great blazing lamp burns brilliantly in the center of the lantern of the tower, and all that part of the radiation from the flame which would naturally have beamed upward, or downward, or laterally, or back toward the land, is so turned by a curious system of reflectors and polyzonal lenses, most ingeniously contrived and very exactly adjusted, as to be thrown forward in one broad and ...
— Cleopatra • Jacob Abbott


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