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irradiation (n.)

1580s, in reference to light (literally and figuratively), from French irradiation, noun of action from past participle stem of Latin irradiare (see irradiate). Of X-rays, etc., from 1901.

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Definitions of irradiation

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