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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.
White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.All leukocytes are produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell.onocytes and neutrophils are phagocytic. The number of leukocytes in the blood is often an indicator of disease, and thus the WBC count is an important subset of the complete blood count. The normal white cell count is usually between 4 and 11 Ã 10 9 /L.