Final answer:
The abbreviation V.A.D stands for Venous Access Device, which is a medical device that provides a route for accessing the venous system.
Step-by-step explanation:
The abbreviation V.A.D. stands for Venous Access Device. In the medical field, a V.A.D is a type of device that provides a route for accessing the venous system, usually for the administration of medication or fluids, or for obtaining blood samples. It is commonly used in situations where frequent access to the bloodstream is required, such as in patients receiving chemotherapy or long-term antibiotic therapy.