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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 are a type of white blood cell. The presence of  leukocytes in the urine is likely to mean that there is a bacterial  infection, quite possibly a urinary tract in â¦ fection.eukocytes are a type of white blood cell. The presence of  leukocytes in the urine is likely to mean that there is a bacterial  infection, quite possibly a urinary tract in â¦ fection.