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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 (abbreviated WBCs, also called leukocytes from leuko = white + cyte = cell) comprise several distinct cell types, neutrophils, eosinophils, basophils, lymphocytes and monocytes.