| ironmonger | järnhandlare |
| ironstove | kamin |
| ironware | järnvaror |
| ironwork industry | gjuteriindutri |
| ironworks | stålverk |
| irony | ironi |
| Iroquoian languages | Irokesiska språk |
| Iroquois | Irokeser |
| irradiate | utstråla |
| irradiation | bestrålning |
| irrational | irrationell |
| Irrational number | Irrationellt tal |
| irrational root | irrationellt tal |
| Irrawaddy Dolphin | Irrawadidelfin |
| irreconcilable | oförenlig |
| irrecoverable | oindrivbar |
| irredeemable | oinlösbar |
| Irredentism | Irredentism |
| irreducible | oreducerbar |
| Irreducible complexity | Irreducibel komplexitet |
| irrefutable | ovedersäglig |
| irrefutably | obestridlig |
| irregular | onormal |
| irregularity | oregelbundenhet |
| irregularly | inkonsekvent |
| irrelevance | ovidkommande anmärkning |
| irrelevancy | ovidkommande anmärkning |
| irrelevant | irrelevant |
| irreligious | irreligiös |
| irremediable | obotlig |
| irremovable | ej flyttbar |
| irreparable | irreparabel |
| irreplaceable | oersättlig |
| irrepressible | okuvlig |
| irrepressibly | okontrollerat |
| irreproachable | oförvitlig |
| irreproachably | oklanderligt |
| irresistable | oemotståndlig |
| irresistible | oemotståndlig |
| irresolute | tveksam |
| irresolution | vankelmod |
| irrespective | oavsett |
| irrespective of | utan hänsyn till |
| irresponsibility | oansvarighet |
| irresponsible | tillräknelig |
| irretrievable | oersättlig |
| irretrievably lost | räddningslöst förlorat |
| irreverence | vanvördnad |
| irreverent | vanvördig |
| irreversibility of the phenomenon | irreversibelt fenomen |
| irrevocable | avgjord |
| irrigate | spola |
| irrigation | spolning |
| Irrigation channel | Kanal |
| irrigation farming | bevattningsjordbruk |
| irrigation system | bevattningssystem |
| irritability | lättretlighet |
| irritable | vresig |
| irritant | irriterande |
| irritants | irriterande |
| irritate | reta |
| irritated | arg |
| irritates | retas |
| irritating | förarglig |
| irritation | förargelse |
