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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 a white blood cell count (the leukocyte count) above the normal range in the blood.It is frequently a sign of an inflammatory response, most commonly the result of infection, but may also occur following certain parasitic infections or bone tumors.eukocytosis is a white blood cell count (the leukocyte count) above the normal range in the blood.