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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.
[edit on Wikidata] Leukocytosis is white cells (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.