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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.
Leukocytes function as phagocytes of bacteria, fungi, and viruses; detoxifiers of proteins that may result from allergic reactions and cellular injury; and immune system cells. Also spelled leucocyte. Also called white blood cell, white corpuscle.