Interradial :: Interradial (a.) Between the radii, or rays; -- in zoology, said of certain parts of radiate animals; as, the interradial plates of a starfish..
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..