irradiation
Meanings
Irradiation, rayonnement, éclat
Examples :
L'agrandissement apparent d'un objet brillant vu sur un fond sombre
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, especially when a little out of focus.