Irradiation :: Irradiation (n.) Fig.: Mental light or illumination.
Irradiation :: Irradiation (n.) 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..
Radiatiform :: Radiatiform (a.) Having the marginal florets enlarged and radiating but not ligulate, as in the capitula or heads of the cornflower..