What is the root term for heat in medical language?

The root term for heat in medical language is derived from the prefix "therm/o," which is used in various medical terms related to heat and temperature. This root word is commonly associated with terms that deal with thermal energy, such as "thermotherapy" (treatment by heat) and "thermometry" (measurement of temperature).

In contrast, while some of the other terms listed may seem related, they pertain to different concepts. "Therap/o" refers to therapy or treatment, "calor/o" is associated with heat in a more general sense but is not as widely used as "therm/o," and "fervor/o" relates more to fever or intense heat in a clinical sense. Therefore, "therm/o" stands out as the most accurate and commonly accepted root term for heat in the medical field.