| irridenta | (noun) a region that is related ethnically or historically to one country but is controlled politically by another | Synonyms: irredenta |
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| irridentism | (noun) the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related | Synonyms: irredentism |
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| irridentist | (noun) an advocate of irredentism | Synonyms: irredentist |
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| irrigation | (noun) supplying dry land with water by means of ditches etc | - |
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| (noun) (medicine) cleaning a wound or body organ by flushing or washing out with water or a medicated solution | - |
| irritability | (noun) a disposition to exhibit uncontrolled anger | Synonyms: biliousness, peevishness, pettishness, snappishness, surliness, temper |
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| (noun) excessive sensitivity of an organ or body part | Synonyms: excitability |
| (noun) an irritable petulant feeling | Synonyms: choler, crossness, fretfulness, fussiness, peevishness, petulance |
| irritant | (noun) something that causes irritation and annoyance | Synonyms: thorn |
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| irritation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: aggravation, provocation |
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| (noun) the act of troubling or annoying someone | Synonyms: annoyance, annoying, vexation |
| (noun) an uncomfortable feeling of mental painfulness or distress | Synonyms: discomfort, soreness |
| (noun) a sudden outburst of anger | Synonyms: pique, temper |
| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, botheration, vexation |
| (noun) the neural or electrical arousal of an organ or muscle or gland | Synonyms: excitation, innervation |
| (noun) (pathology) abnormal sensitivity to stimulation | - |