Index of letter I
| -i- | A connecting vowel. |
| -i1 | Forming plurals. |
| -i2 | Adjectives and nouns relating to countries. |
| -ia | Forming nouns. |
| -iac | See -ac |
| -ial | See -al |
| -ian | Forming adjectives and nouns. |
| -iana | See -ana |
| -iasis | See -asis |
| -iast | See -ast |
| -iatric | Medical practice or treatment. |
| iatro- | A physician or medical treatment. |
| -iatry | See -iatric |
| Ibero- | Iberian; Iberian and … |
| -ibility | See -able |
| -ic | Forming adjectives and some nouns. |
| -ice | Forming nouns. |
| ichthyo- | Fish; fishlike. |
| -ician | Nouns denoting occupations. |
| -ick | See -ic |
| -icle | See -cule |
| icono- | An image or likeness. |
| icos- | Twenty. |
| -ics | A subject of study or branch of knowledge. |
| -id1 | Forming adjectives. |
| -id2 | Forming nouns. |
| -ida | Taxonomic groups. |
| -idae | Taxonomic groups. |
| ideo- | Idea. |
| -ides | Plant and animal genera. |
| -idine | Organic ring compounds containing nitrogen. |
| idio- | Personal; own. |
| -idium | A structure in a plant or animal. |
| -ie | See -y2 |
| -ienne | See -enne |
| -ier | A person engaged in an occupation or activity. |
| -ifera | See -fera |
| -iferous | See -ferous |
| -ific | See -fic |
| -ification | See -fication |
| -iform | See -form |
| -iformes | See -formes |
| -ify | See -fy |
| -igerous | See -gerous |
| il- | See in-1 and in-2 |
| -ile | Forming adjectives and some nouns. |
| ile(o)- | The ileum. |
| ili(o)- | The ilium. |
| -ility | See -ile |
| -ily | See -ly |
| -im | A plural ending of words from Hebrew. |
| im- | See in-1 and in-2 |
| -imeter | See -meter |
| imid(o)- | Various amine derivatives. |
| immuno- | Immune or immunity. |
| -in1 | See -ine3 |
| in-1 | Not; without. |
| -in2 | A gathering of people having a common purpose, typically as a form of protest. |
| in-2 | In, into. |
| -ina | Forming nouns. |
| -inae | Animal subfamilies. |
| indi- | See indo-2 |
| Indo-1 | India; India and … |
| ind(o)-2 | A chemical substance related to indigo or an indole. |
| -ine1 | Forming adjectives. |
| -ine2 | Forming feminine nouns. |
| -ine3 | Forming nouns. |
| -iness | See -ness |
| infra- | Below, underneath, beneath. |
| -ing1 | Forming nouns derived from verbs. |
| -ing2 | Forming the present participle of verbs, and adjectives from nouns. |
| -ing3 | Forming nouns. |
| -ino | Forming diminutives. |
| ino- | Fibrous tissue or muscle. |
| inter- | Between or among; mutually or reciprocally. |
| intra- | On the inside; within. |
| intro- | Into; inwards. |
| iod(o)- | Iodine. |
| -ion | Forming nouns denoting verbal action. |
| -ior | Forming adjectives of comparison. |
| -ious | See -ous |
| -ique | See -ic |
| ir- | See in-1 and in-2 |
| -iridine | See -idine |
| irid(o)- | The rainbow; the iris. |
| is- | See iso- |
| -isation | See -ize |
| ischio- | The ischium. |
| -ise1 | See -ize |
| -ise2 | Forming nouns. |
| -ish1 | Forming adjectives. |
| -ish2 | Forming verbs. |
| -ism | Forming nouns. |
| iso- | Equal; isomeric. |
| -ison | Forming nouns. |
| -ist | Forming personal nouns and some related adjectives. |
| -ista | A supporter of a person or organization. |
| -it | See -ite2 |
| Italo- | Italian; Italian and …. |
| -ite1 | Forming nouns. |
| -ite2 | Forming adjectives, nouns, and verbs. |
| -itic | Forming adjectives and nouns. |
| -ition | Forming nouns. |
| -itious | Forming adjectives. |
| -itis | Inflammatory disease. |
| -itive | Forming adjectives. |
| -itol | Polyhydric alcohols. |
| -ity | A quality or condition. |
| -ium | Forming nouns; chemical elements. |
| -ive | Showing a quality or tendency. |
| -ivore | See -vore |
| -ize | Forming verbs. |
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