irradiation

英[ɪ,reɪdɪ'eɪʃ(ə)n] 美[ɪ,redɪ'eʃən]

1. the condition of being exposed to radiation

2. a column of light (as from a beacon)

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 radiation from a radioactive substance