| irradiate | (verb) expose to radiation | Synonyms: ray |
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| (verb) cast rays of light upon | - |
| (verb) give spiritual insight to; in religion | Synonyms: enlighten |
| irradiation | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, radiation, radiation therapy, radiotherapy |
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| (noun) the apparent enlargement of a bright object when viewed against a dark background | - |
| (noun) (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus | - |
| (noun) (physiology) the spread of sensory neural impulses in the cortex | - |
| (noun) a column of light (as from a beacon) | Synonyms: beam, beam of light, light beam, ray, ray of light, shaft, shaft of light |
| (noun) the condition of being exposed to radiation | - |
| irrational | (adjective) not consistent with or using reason | - |
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| (adjective) real but not expressible as the quotient of two integers | - |
| (noun) a real number that cannot be expressed as a rational number | Synonyms: irrational number |
| irrationality | (noun) the state of being irrational; lacking powers of understanding | Synonyms: unreason |
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| irrationally | (adverb) in an irrational manner | - |
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