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irradiation

ir·ra·di·a·tion [ i ràydee áysh'n ]


noun 
Definition:
 
1. irradiating: the act of irradiating somebody or something, or the state of being irradiated

2. lighting effect: the visual effect by which a brightly lit thing appears larger against a dark background

3. medical radiation: the medical use of radiation, e.g. X-rays, gamma rays, or neutrons

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