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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.
Leukocytosis is defined as a condition where the white blood cell (WBC) count is increased. The white blood cells (WBC) or leukocytes play an important role in the bodys immune system to fight against infections. Various types of WBCs include the neutrophils, lymphocytes, monocytes, eosinophils and basophils.