lymph node A mass of lymphoid tissue, many of which occur at intervals along the lymphatic system. Lymph in the lymphatic vessels flows through the lymph nodes, which filter out bacteria and other foreign particles, so preventing them from entering the bloodstream and causing infection. The lymph nodes also produce lymphocytes. In humans, major lymph nodes occur in the neck, under the arms, and in the groin.
lymph node • n. Physiol. each of a number of small swellings in the lymphatic system where lymph is filtered and lymphocytes are formed.
lymph node See LYMPH.
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