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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



... and thus, on the northern slopes, the rays of the sun do not penetrate and parch the soil. A northern aspect has also the advantage of preserving a much more uniform temperature than a southern aspect, because the excessive radiation and evaporation in the southern slopes greatly reduces the temperature at night, while in the day they are heated to excess by the action of the sun's rays striking the surface nearly at right angles. The practical effects of aspect on the plants are ...
— Gold, Sport, And Coffee Planting In Mysore • Robert H. Elliot

... the sleep or nyctitropic movements of leaves— Presence of pulvini—The lessening of radiation the final cause of nyctitropic movements—Manner of trying experiments on leaves of Oxalis, Arachis, Cassia, Melilotus, Lotus and Marsilea and on the cotyledons of Mimosa—Concluding remarks on radiation from leaves—Small differences in the conditions make a great difference in the ...
— The Power of Movement in Plants • Charles Darwin

... Heauenly Sunne, Mone, and Sterres: not so much, as the Mariner, or Husband man: no, not so much, as the Elephant doth, as the Cynocephalus, as the Porpentine doth: nor will allow these perfect, and incorruptible mighty bodies, so much vertuall Radiation, & Force, as they see in a litle peece of a Magnes stone: which, at great distance, sheweth his operation. And perchaunce they thinke, the Sea & Riuers (as the Thames) to be some quicke thing, and so to ebbe, and flow, run in and out, ...
— The Mathematicall Praeface to Elements of Geometrie of Euclid of Megara • John Dee

... heat. Every muscle contraction uses up a little energy. Every breath deprives us of heat and carries away carbon dioxide, the latter being formed by oxidation of tissues in the body. Every minute we lose heat by radiation from the skin. Every thought requires a small amount of food. If we worry, the leak of nervous energy is tremendous, but at the same time we put ourselves in position where we are unable to replenish our stock, ...
— Maintaining Health • R. L. Alsaker

... again in the low plain about the Aral lake and the Caspian, a severe climate prevailed during the winter, while the summer combined intense heat during the day with extraordinary cold—the result of radiation—at night. Still more bitter weather was experienced in the mountain regions of these parts—in the Bolor, the Thian Chan, the Himalaya, and the Paropamisus or Hindu Kush—where the winters lasted more than half the year, deep snow covering ...
— The Seven Great Monarchies Of The Ancient Eastern World, Vol 5. (of 7): Persia • George Rawlinson


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