Which medical root refers to sweat?

The root "hidr/o" refers specifically to sweat. In medical terminology, this root is commonly used in words related to sweating or perspiration, such as "hidradenitis," which denotes inflammation of the sweat glands. This root is derived from the Greek word "hidros," meaning sweat.

In contrast, the other roots do not relate to sweat. For example, "hist/o" pertains to tissue and is used in terms like "histology," the study of tissues. "Home/o" relates to sameness or stability, often in the context of homeostasis, which is the body's ability to maintain stable internal conditions. "Humer/o" references the humerus, the bone of the upper arm, and does not have any connection to sweat or perspiration. Therefore, "hidr/o" is the appropriate choice in this context when referring to sweat.