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irradiation - 6 dictionary results
ir⋅ra⋅di⋅a⋅tion
[i-rey-dee-ey-shuh
n] 
–noun
| 1. | the act of irradiating. |
| 2. | the state of being irradiated. |
| 3. | intellectual or spiritual enlightenment. |
| 4. | a ray of light; beam. |
| 5. | Optics. the apparent enlargement of an object when seen against a dark background. |
| 6. | the use of x-rays or other forms of radiation for the treatment of disease, the making of x-ray photographs, the manufacture of vitamin D, etc. |
| 7. | exposure or the process of exposure to x-rays or other radiation. |
| 8. | Physics. irradiance. |
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Cite This Source
| ir·ra·di·a·tion
(ĭ-rā'dē-ā'shən) Pronunciation Key
n.
|
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
| irradiation | |
noun | |
| 1. | the condition of being exposed to radiation |
| 2. | a column of light (as from a beacon) [syn: beam] |
| 3. | (physiology) the spread of sensory neural impulses in the cortex |
| 4. | the apparent enlargement of a bright object when viewed against a dark background |
| 5. | (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus |
| 6. | (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance [syn: radiotherapy] |
irradiation ir·ra·di·a·tion (ĭ-rā'dē-ā'shən)
n.
- Exposure or subjection to the action of radiation for diagnostic or therapeutic purposes.
- Medical treatment by exposure to radiation.
- The spread of a nervous impulse beyond the usual path of conduction.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Main Entry: ir·ra·di·a·tion
Pronunciation: ir-"Ad-E-'A-sh&n
Function: noun
1 a : the radiation of a physiologicallyactive agent from a point of origin within the body; especially : the spread of a nervous impulse beyond the usual conduction path b : apparent enlargement of a lightor bright object or surface when displayed against a dark background
2 a : exposure to radiation (as ultraviolet light, X rays, or alpha particles) b : applicationof radiation (as X rays or gamma rays) especially for therapeutic purposes
3 : IRRADIANCE
Irradiation
Ir*ra`di*a"tion\, n. [Cf. F. irradiation.]1. Act of irradiating, or state of being irradiated. 2. Illumination; irradiance; brilliancy. --Sir W. Scott. 3. Fig.: Mental light or illumination. --Sir M. Hale. 4. (Opt.) The apparent enlargement of a bright object seen upon a dark ground, due to the fact that the portions of the retina around the image are stimulated by the intense light; as when a dark spot on a white ground appears smaller, or a white spot on a dark ground larger, than it really is, esp. when a little out of focus.
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