Open English Wordnet
Nouns
(n)beam, beam of light, light beam, ray, ray of light, shaft, shaft of light, irradiationa column of light (as from a beacon)
(n)irradiation(Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus
(n)radiotherapy, radiation therapy, radiation, actinotherapy, irradiation(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance