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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.
Polymorphonuclear leukocyte: A type of white blood cell with a nucleus that is so deeply lobated or divided that the cell looks to have multiple nuclei.Informally called a poly.olymorphonuclear leukocyte: A type of white blood cell with a nucleus that is so deeply lobated or divided that the cell looks to have multiple nuclei. Informally called a poly.