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Pronunciation:  i`reydee'eyshun

WordNet Dictionary
  1. [n]  (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
  2. [n]  (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus
  3. [n]  the apparent enlargement of a bright object when viewed against a dark background
  4. [n]  (physiology) the spread of sensory neural impulses in the cortex
  5. [n]  a column of light (as from a beacon)
  6. [n]  the condition of being exposed to radiation

IRRADIATION is a 11 letter word that starts with I.


 Synonyms: actinotherapy, beam, beam of light, light beam, radiation, radiation therapy, radiotherapy, ray, ray of light, shaft, shaft of light
 See Also: condition, Curietherapy, generalisation, generalization, heat ray, high beam, illusion, laser beam, light, low beam, moonbeam, moonray, phototherapy, radium therapy, semblance, spread, spreading, status, stimulus generalisation, stimulus generalization, sunbeam, sunray, therapy, visible light, visible radiation, X-ray therapy



Webster's 1913 Dictionary
\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.

Medical Dictionary
 Definition: The use of high-energy radiation from x-rays, neutrons, and other sources to kill cancer cells and shrink tumors.
Thesaurus Terms
 Related Terms: anhydration, arc lighting, black and white, blast-freezing, bottling, brining, canning, chiaroscuro, cobalt therapy, contrast, corning, curietherapy, curing, decorative lighting, dehydration, desiccation, direct lighting, dry-curing, drying, electric lighting, emanation, embalming, enlightenment, evaporation, festoon lighting, floodlighting, fluorescent lighting, freeze-drying, freezing, fuming, gaslighting, glow lighting, highlight, highlights, illumination, incandescent lighting, indirect lighting, interstitial irradiation therapy, irradiance, irradiancy, irradiation therapy, isotope therapy, jerking, light, light and shade, light source, lighting, luminous energy, marination, mummification, overhead lighting, photosensitivity, pickling, potting, quick-freezing, radiance, radiancy, radiant energy, radiation, radiation therapy, radiotherapeutics, radiotherapy, radium therapy, radiumization, ray therapy, refrigeration, roentgen ray therapy, roentgenization, roentgenometry, roentgenotherapy, roentgentherapy, salting, seasoning, sidelight, smoking, spot lighting, stage lighting, strip lighting, stuffing, taxidermy, tinning, tonality, visible radiation, X-ray dosimetry, X-ray therapy