Definition of Neutrophil

Neutrophil: A type of white blood cell, specifically a form of granulocyte, filled with neutrally-staining granules, tiny sacs of enzymes that help the cell to kill and digest microorganisms it has engulfed by phagocytosis. The mature neutrophil has a segmented nucleus (it is called a seg or poly) while the immature neutrophil has band-shape nucleus (it is called a band). The neutrophil has a lifespan of about 3 days.

Neutrophilia, an increased proportion of neutrophils in the blood, is a common finding with acute bacterial infections.

Neutropenia, a decreased proportion of neutrophils, may be seen with viral infections and after radiotherapy and chemotherapy. Neutropenia lowers the immunologic barrier to bacterial and fungal infection.

Also referred to as neutrophils

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