| Irrigate, water, 337. |
| Irritable, excitable, 825. |
| irascible, 901. |
| Irritate, provoke, 898. |
| incense, 900. |
| fret, 828. |
| pain, 830. |
| excite, 171. |
| Irruption, ingress, 294. |
| invasion, 716. |
| Isis, deity, 979. |
| Island, island, 346. |
| Isochronous, synchronism, 120. |
| Isolation, singleness, 87. |
| seclusion, 893. |
| detachment, 44. |
| irrelation, 10. |
| Isomeric, part, 51. |
| Isomorphism, form, 240. |
| Isothermal, heat, 382. |
| Issue, effect, 154. |
| event, 151. |
| end, 67. |
| posterity, 167. |
| depart, 293. |
| egress, 295. |
| stream, 347. |
| distribute, 73. (to join)476. |
| Issueless, unproductive, 169. |
| Isthmus, narrowness, 203. |
| connection, 45. |
| Italicise, emphasise, 642. |
| Italics, indication, 550. |
| Itch, desire, 865. |
| titillation, 380. |
| Item, addition, 37. |
| speciality, 79. |
| adjunct, 39. |
| part, 51. |
| Iteration, repetition, 90, 104. |
| Itinerant, moving, 266. |
| traveller, 268. |
| Itinerary, description, 594. |
| guide, 695. |
| Ivory, whiteness, 430. |
|
