| 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 |
| irrigate | (verb) supply with a constant flow or sprinkling of some liquid, for the purpose of cooling, cleansing, or disinfecting | - |
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| (verb) supply with water, as with channels or ditches or streams | Synonyms: water |
| irritate | (verb) excite to an abnormal condition, or chafe or inflame | - |
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| (verb) excite to some characteristic action or condition, such as motion, contraction, or nervous impulse, by the application of a stimulus | - |
| (verb) cause annoyance in; disturb, especially by minor irritations | Synonyms: annoy, bother, chafe, devil, get at, get to, gravel, nark, nettle, rag, rile, vex |
| irrupt | (verb) increase rapidly and in an uncontrolled manner | Synonyms: explode |
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| (verb) erupt or intensify suddenly | Synonyms: break open, burst out, erupt, flare, flare up |
| (verb) enter uninvited | Synonyms: intrude |