lymph node

tissue of the lymphatic system which helps prevent foreign bodies from entering the bloodstream

Lymph nodes are components of the lymphatic system. They are sometimes informally called lymph glands but, as they do not secrete substances, such terminology is not entirely accurate. They are found mostly in the neck area.Lymph nodes are filters or traps for foreign particles and contain white blood cells.
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Lymph node n. Any of the small, oval or round bodies, located along the lymphatic vessels, that supply lymphocytes to the bloodstream and remove [more]Lymph node - Community and Resources

Noun
1. the source of lymph and lymphocytes
(synonym) lymph gland, node
(hypernym) lymphatic tissue, lymphoid tissue
(hyponym) axillary node
(part-holonym) circulatory system, cardiovascular system

[limf node]
A rounded mass of lymphatic tissue that is surrounded by a capsule of connective tissue. Lymph nodes filter lymph (lymphatic fluid), and they store lymphocytes (white blood cells). They are located along lymphatic vessels. Also called a lymph gland.