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Radiations

 [rey-dee-ey-shuhn]   Origin

ra·di·a·tion

   [rey-dee-ey-shuhn]
noun
1.
Physics.
a.
the process in which energy is emitted as particles or waves.
b.
the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and absorbed by another body.
c.
the energy transferred by these processes.
2.
the act or process of radiating.
3.
something that is radiated.
4.
radial arrangement of parts.
Origin:
1545–55; < Latin radiātiōn- (stem of radiātiō) a glittering, shining. See radiate, -ion

Related forms
ra·di·a·tion·al, adjective
an·ti·ra·di·a·tion, adjective
in·ter·ra·di·a·tion, noun
non·ra·di·a·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Radiations is always a great word to know.
So is callithumpian. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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Etymonline
Word Origin & History

radiation
1555, from L. radiationem (nom. radiatio) "a shining, radiation," noun of action from radiare "to beam, shine," from radius "beam of light" (see radius).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

radiation ra·di·a·tion (rā'dē-ā'shən)
n.

  1. The act or condition of diverging in all directions from a center.

  2. The emission and propagation of energy in the form of rays or waves.

  3. The energy radiated or transmitted in the form of rays, waves, or particles.

  4. A stream of particles or electromagnetic waves that is emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.

  5. Radiotherapy.

  6. The radial arrangement of anatomical or histological parts.

  7. The spread of a group of organisms into new habitats.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
radiation   (rā'dē-ā'shən)  Pronunciation Key 

    1. Streams of photons, electrons, small nuclei, or other particles. Radiation is given off by a wide variety of processes, such as thermal activity, nuclear reactions (as in fission), and by radioactive decay.

    2. The emission or movement of such particles through space or a medium, such as air. See Notes at conduction, electromagnetic radiation.

  2. The use of such energy, especially x-rays, in Medical diagnosis and treatment.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

radiation definition


Energy sent out in the form of particles or waves. (See alpha radiation, beta radiation, blackbody, cosmic rays, electromagnetic radiation, fluorescence, gamma radiation, photon, and quanta.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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