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Definition

A category of white blood cells; one of three types of granulocyte (along with eosinophils and neutrophils) characterized by a cytoplasm with dark-staining granules and a lobed nucleus (that is often difficult to see due to the dark cytoplasmic granules).

Source: Lebofee, M.J. and Pierce, B.E. 2002. Microbiology Laboratory Theory and Application. Morton Publishing Company.