― What is the definition of fever? ∙ The question above seems to be simple, but many of us may not be clear about what fever exactly is? Fever (pyrexia in medical term) is known to all of us. But many of us may not have clear idea about what fever actually is or what the definition of fever is? We all know what fever is, i.e. rise of body temperature above that of normal body temperature. Many of us also know that normal body temperature is 98.4 degree Fahrenheit (98.4°F) or 37 degree [...].