irradiation in WordNet English dictionary

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