irradiation
n. பிரகாசித்தல், ஔதப்பிறக்கம், இருண்ட பின்னணியில் ஔதயார்ந்த பொருளின் விளிம்பு பெரிதாகத் தெரியும் நிலை, அவிரொளிக்காட்சி.
Ir*ra`di*a"tion, n. Etym: [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.) Defn: 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.