fever

v. cause to develop a fever; excite, cause tension

n. high body temperature; disease characterized by high body temperature; tension, excitement

This is about the medical condition. For other uses, see Fever (disambiguation). Fever (also known as pyrexia, or a febrile response from the Latin word febris, meaning fever, and archaically known as ague) is a frequent medical symptom that describes an increase in internal body temperature to levels that are above normal (the common oral measurement of normal human body temperature is 36.8±0.7 °C or 98.2±1.3 °F). Fever is most accurately characterized as a temporary elevation in the body's thermoregulatory set-point, usually by about 1–2°C. Fever differs from hyperthermia, which is an increase in body temperature over the body's thermoregulatory set-point (due to excessive heat production or insufficient thermoregulation, or both). Carl Wunderlich discovered that fever is not a disease but a symptom of disease.
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A fever is any body temperature elevation over 100 °F. Description A healthy person's body temperature fluctuates [more]Fever - Community and Resources

Noun
1. a rise in the temperature of the body; frequently a symptom of infection
(synonym) febrility, febricity, pyrexia, feverishness
(hypernym) symptom
(hyponym) hyperpyrexia
2. intense nervous anticipation; "in a fever of resentment"
(hypernym) anticipation, expectancy
(hyponym) buck fever

Although a fever technically is any body temperature above the normal of 98.6 degrees F. (37 degrees C.), in practice a person is usually not considered to have a significant fever until the temperature is above 100.4 degrees F (38 degrees C.). The temperature is measured with a thermometer.