What is the medical root for fiber?

The medical root for fiber is "fibr/o." This root is derived from the Latin term for fiber and is often used in various medical terms to refer specifically to fibrous tissues or connective fibers in the body. For instance, terms like "fibrosis" and "fibrillation" utilize this root to describe conditions related to fibers or fibrous tissues.

The other roots provided relate to different biological concepts: "lith/o" pertains to stones or calculus, such as in "lithiasis," which refers to stone formation; "my/o" refers to muscle, as seen in terms like "myopathy," which describes muscle disease; and "por/o" relates to pores or passages, commonly seen in terms like "porosis," which signifies a condition of porousness, often in reference to bone density. Each of these roots has its unique application in medical terminology, making "fibr/o" the correct choice for the term related specifically to fiber.