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3 definitions found
 for irradiation
From The Collaborative International Dictionary of English v.0.48 :

  irradiation \ir*ra`di*a"tion\ ([i^]r*r[=a]`d[i^]*[=a]"sh[u^]n),
     n. [Cf. F. irradiation.]
     [1913 Webster]
     1. Act of irradiating, or state of being irradiated; as,
        irradiation of foods with X-rays can preserve their
        freshness by killing the bacteria that cause spoilage .
        [1913 Webster +PJC]
  
     2. Illumination; irradiance; brilliancy. --Sir W. Scott.
        [1913 Webster]
  
     3. Fig.: Mental light or illumination. --Sir M. Hale.
        [1913 Webster]
  
     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.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  irradiation
      n 1: the condition of being exposed to radiation
      2: a column of light (as from a beacon) [syn: beam, beam of
         light, light beam, ray, ray of light, shaft, shaft
         of light, irradiation]
      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,
         radiation therapy, radiation, actinotherapy,
         irradiation]

From Moby Thesaurus II by Grady Ward, 1.0 :

  85 Moby Thesaurus words for "irradiation":
     X-ray dosimetry, X-ray therapy, 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
  
  

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