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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 an important component of blood and a key player in the body's immune system. A diagram showing different types of leukocytes, or white blood cells.Leukocytes are also known as white blood cells.Macrophages promote tissue growth and repair following an injury.eukocytes are an important component of blood and a key player in the body's immune system. A diagram showing different types of leukocytes, or white blood cells. Leukocytes are also known as white blood cells. Macrophages promote tissue growth and repair following an injury.