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irradiation (i-ra-de-a´shun)

1. The subjective enlargement of a bright object seen against a dark background. 2. Exposure to the action of electromagnetic radiation (e.g., heat, light, x-rays). 3. The spreading of nervous impulses from one area in the brain or cord, or from a tract, to another tract. See also radiation. [L. ir-radio, (in-r), pp. -radi-atus, to beam forth]


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