Medical Definition of Neutrophil. Neutrophil: A type of white blood cell, a granulocyte that is filled with microscopic granules, little sacs containing enzymes that digest microorganisms. Also known as polymorphonuclear leukocyte or poly.
Definition of Neutropenia. Neutropenia: Not enough neutrophils, neutrophils being 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.
Neutropenia is a low white blood cell count. Neutrophils are one type of white blood cell. White blood cells help the body fight infection. People with neutropenia have a low number of these white blood cells, so it is harder for their bodies to fight infection.eutrophils are one type of white blood cell. White blood cells help the body fight infection. People with neutropenia have a low number of these white blood cells, so it is harder for their bodies to fight infection.