Febrile/ˈfiːbraɪl/ Definition 1 of 2Pro Tip 1/3Medical Context Use 'febrile' to describe conditions related to fever in a clinical or medical scenario. The febrile patient was admitted for observation. Pro Tip 2/3Not Always Sick "Febrile" doesn't always mean someone is currently sick; it can refer to potential fever symptoms too. Her febrile appearance worried the doctor. Pro Tip 3/3Avoid Misuse Don't use 'febrile' for normal body temperature or non-feverish conditions. He can't be febrile; he's not showing any fever signs.