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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 another word for white blood cells or WBCs. These are a crucial part of the immune system as they defend our bodies from infectious diseases and foreign materials. There are five different types of leukocytes in our bodies, each of which is derived from bone marrowâs hematopoietic stem cell.auses of Leukocytes in Urine. It is common to find white blood cells and protein in the urine when pregnant. There may be increased leukocyte counts as well as proteins entering from the vagina. It may be a bladder infection if high levels are persistent.