ir*ra`di*a"tion(r*r`d*"shn), n. [Cf. F. irradiation.]
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.
3. Fig.: Mental light or illumination.
Sir M. Hale.
(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.
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Sun 16th December 2018