1. (

• irradiation

) the condition of being exposed to radiation ;

2. (

• beam ,
• beam_of_light ,
• light_beam ,
• ray ,
• ray_of_light ,
• shaft ,
• shaft_of_light ,
• irradiation

) a column of light (as from a beacon) ;

3. (

• irradiation

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

4. (

• irradiation

) the apparent enlargement of a bright object when viewed against a dark background ;

5. (

• irradiation ,

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

6. (

• radiotherapy ,
• radiation_therapy ,
• radiation ,
• actinotherapy ,
• irradiation

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