Medical Definition of sick
1a: affected with disease or ill healthb: of, relating to, or intended for use in sickness <a sick ward>c: affected with nausea : inclined to vomit or being in the act of vomiting <sick to one's stomach> <was sick in the car>
2: mentally or emotionally unsound or disordered
Seen and Heard
What made you want to look up sick? Please tell us where you read or heard it (including the quote, if possible).