| Name | Description |
|---|---|
| Insanity | Mental derangements. |
| Insect repellent | a substance that repels insects. |
| Insecticidal | An agent that kills insects. |
| Insecticide | a substance that kills insects. |
| Insomnia | Wakefulness; inability to sleep. |
| Intermittent fever | Fever, which is marked by intervals of normal temperature between periods of rise of temperature. |
| Intoxication | Poisoning; Acute alcoholism. |
| Ischuria | Suppression of urine. |
| Itch | An irritating sensation in the skin that arouses the desire to scratch; common name for scabies. |
| Jaundice | a yellow tinge to the skin, eyes, etc., caused by an increase in bile pigment. |
