- infant food
- in the lap of luxury
- import certificate
- insignificantly
- insurable
- introspective
- individualized
- individualised
- in low spirit
- imperative second person singular form of the verb
- inaesthetic
- individual health
- in the vicinity
- imbecilic
- impeccant
- in interlude (in a drama)
- interdenominational
- insolvable
- inurbane
- intractable
- irrevocably firm
- itchy
- itching sensation
- itchiness
- in bondage
- instituted
- in memoriam
- in commission
- internal combustion engine
- intracranial abscess
- infertile
- incontinentia pigmenti
- irenic
- isochromatic
- imperiously
- in the nature of
- in the first place
- in turn
- irony
- inscrutable
- isthmus tubae uterinae
- intercom
- intravenous anaesthesia
- internal schema
- ivory osteoma
- in the closest of counsels
- instantaneously
- indexes
- intramural rupture
- immersed (in)