Definitions for: Irradiation


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



Webster (1913) Definition: 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.

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

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