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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 two basic types of leukocytes are: 1  phagocytes, cells that chew up invading organisms. 2  lymphocytes, cells that allow the body to remember and recognize previous invaders and help the body destroy them.