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IRRADIATION - Definiția din dicționar

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ir*ra`di*a"tion (ĭr*r&ā;`dĭ*&ā;"shŭn), n. [Cf. F. irradiation.]
[1913 Webster]

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 .
[1913 Webster +PJC]

2. Illumination; irradiance; brilliancy. Sir W. Scott.
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3. Fig.: Mental light or illumination. Sir M. Hale.
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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.
[1913 Webster]