irradiation

A column of light (as from a beacon).

(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance.

(Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus.

(physiology) the spread of sensory neural impulses in the cortex.

The apparent enlargement of a bright object when viewed against a dark background.

The condition of being exposed to radiation.