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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 ir·ra·di·a·tion /ɪˌrediˈeʃən/

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 ir·ra·di·a·tion /ɪrˌedɪˈeʃən/ 名詞

From: Webster's Revised Unabridged Dictionary (1913)

 ir·ra·di·a·tion n.
 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 .
 2. Illumination; irradiance; brilliancy.
 3. Fig.: Mental light or illumination.
 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.

From: WordNet (r) 2.0

      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]
      3: (physiology) the spread of sensory neural impulses in the
      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 radiation from a radioactive substance [syn: radiotherapy,
          radiation therapy, radiation, actinotherapy]