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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.
1.Lymphocytes are a type of white blood cells while leukocytes are equivalently termed in general as white blood cells. 3.There are three types of lymphocytes while there are five types of leukocytes, one of which are lymphocytes.