Irradiation - Definition

n 1: the condition of being exposed to radiation
2: a column of light (as from a beacon) [syn: beam, beam of
light, light beam, ray, ray of light, shaft, shaft
of light, irradiation]
3: (physiology) the spread of sensory neural impulses in the
cortex
4: the apparent enlargement of a bright object when viewed
against a dark background
5: (Pavolvian conditioning) the elicitation of a conditioned
response by stimulation similar but not identical to the
original stimulus
6: (medicine) the treatment of disease (especially cancer) by
exposure to a radioactive substance [syn: radiotherapy,
radiation therapy, radiation, actinotherapy,
irradiation]