Definition of Iradiation
Ir*ra`di*a"tion (?), n. [Cf. F.
irradiation.]
1. Act of irradiating, or state of being
irradiated.
2. Illumination; irradiance;
brilliancy. Sir W. Scott.
3. Fig.: Mental light or illumination.
Sir M. Hale.
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.
- Webster's Unabridged Dictionary (1913)
- act of irradiating, or state of being irradiated.
- illumination; irradiance; brilliancy.
- fig.: mental light or illumination.
- 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.
- a process of sterilisation whereby radiation is passed through a bag containing food, utensils, etc., to sterilise the contents.
- The Nuttall Encyclopedia
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