1. [ noun ] the apparent enlargement of a bright object when viewed against a dark background
Related terms: illusion
2. [ noun ] (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus
Related terms: generalisation
3. [ noun ] (physiology) the spread of sensory neural impulses in the cortex
Related terms: spread physiology
4. [ noun ] (physics) a column of light (as from a beacon)
Synonyms: ray beam light_beam shaft_of_light ray_of_light shaft beam_of_light
Related terms: light sunbeam heat_ray laser_beam moonbeam low_beam high_beam irradiate
5. [ noun ] the condition of being exposed to radiation
Related terms: condition irradiate
6. [ noun ] (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
Synonyms: radiation_therapy actinotherapy radiation radiotherapy
Related terms: therapy radium_therapy X-ray_therapy phototherapy medicine
Similar spelling:   irradiate