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Home Â» Humoral Â» Leukocyte. Definition. noun, plural: leukocytes. Any of the blood cells that lack hemoglobin, colourless and with nucleus. Its major function involves the body's immune system, protecting the body against invading microorganisms and foreign particles.
Lymphocytes are categorized as part of the white blood cells but they are actually part of the lymphatic system. Leukocytes are those white blood cells that are created in the bone marrow and mature there before being released into the blood. These cells are usually the first to the site of an infection.