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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 white blood cells that protect the body from infections and certain diseases. White blood cells in the urine are detected by measuring the amount of leukocyte esterase in the urine.Esterase is an enzyme that is produced by white blood cells, and it is the identifying factor in detecting leukocytes.eukocytes are white blood cells that protect the body from infections and certain diseases. White blood cells in the urine are detected by measuring the amount of leukocyte esterase in the urine.