A type of immune cell that has granules (small particles) with enzymes that are released during infections, allergic reactions, and asthma. Neutrophils, eosinophils, and basophils are polymorphonuclear leukocytes. A polymorphonuclear leukocyte is a type of white blood cell. Also called granular leukocyte, granulocyte, and PMN.
( PAH-lee-MOR-foh-NOO-klee-er LOO-koh-site )
Source: NCI Dictionary of Cancer Terms
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