Lymphatic/lɪmˈfætɪk/ Definition 1 of 2Pro Tip 1/3Body Defense Indicates its role in protecting the body against illness. The lymphatic system helps defend against infections. Pro Tip 2/3Medical Context Used often in health and medical discussions, textbooks, and consultations. Lymphatic health is vital for a robust immune response. Pro Tip 3/3Fluid Movement Refers to the movement of lymph fluid in the body's circulatory system. Lymphatic drainage massages can reduce swelling.