Febrific is an adjective that describes something that induces or causes a fever. It is derived from the Latin word "febri," which means fever. Some synonyms for febrific include feverish, feverous, pyretic, and febrile. Feverish and feverous both suggest a high temperature or fever-like symptoms, while pyretic and febrile indicate a tendency to cause fever or related symptoms. Other related words might include inflammatory, infective, or contagious. When describing a fever or related condition, it is important to use precise language and to consider the context of your writing or speech.