Which prefix means "vein"?

The prefix that means "vein" is indeed represented by the term "veno-." This prefix is derived from Latin, specifically "vena," which means vein. In medical terminology, "veno-" is used to describe anything related to veins, particularly in the context of conditions, procedures, or anatomy pertaining to the venous system.

For example, terms like "venous" relate to the veins in the body, while "venopuncture" refers to the act of puncturing a vein, usually to draw blood or administer medication. Understanding this term is essential in medical contexts, as it helps professionals effectively communicate about procedures and conditions involving veins.

The other options focus on different aspects of medical terminology. "Hepato-" relates to the liver, "hemo-" refers to blood, and "trans-" typically indicates movement across or through something. These roots serve specific functions and are not interchangeable with "veno-" when discussing veins.