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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.
The five types of leukocytes found in peripheral blood are neutrophils, eosinophils and basophils which are the granulocytes, the lymphocytes and the monocytes. The normal white blood count 4000-11,000 per cubic millimeter of blood. A count less than 3,500 cubic millimeter is regarded as leukopenia [3].