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ir·ra·di·ate ir-'ād-ē-.āt vt, -at·ed; -at·ing to affect or treat by radiant energy (as heat) specif to treat by exposure to radiation (as ultraviolet light or gamma rays)
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ir·ra·di·ate (ĭ-raґde-āt) to apply ionizing radiation for therapeutic or diagnostic purposes; see radiotherapy.Medical dictionary. 2011.