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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.
Purpose. Leukocytes are white blood cells, the body's defense mechanism against invaders such as infection and disease. When foreign materials enter the body, white blood cells attack it by destroying infectious agents or producing antibodies.urpose. Leukocytes are white blood cells, the body's defense mechanism against invaders such as infection and disease. When foreign materials enter the body, white blood cells attack it by destroying infectious agents or producing antibodies.