- A system of organs and tissues that process and transport immune cells and lymph.
Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
- The tissues and organs that produce, store, and carry white blood cells that fight infections and other diseases. This system includes the bone marrow, spleen, thymus, lymph nodes, and lymphatic vessels (a network of thin tubes that carry lymph and white blood cells). Lymphatic vessels branch, like blood vessels, into all the tissues of the body.
National Cancer Institute
See also Understanding Medical Terminology.