monocyte

noun

A large, circulating, phagocytic white blood cell, having a single well-defined nucleus and very fine granulation in the cytoplasm. Monocytes constitute from 3 to 8 percent of the white blood cells in humans.

noun

A type of blood leukocyte that differentiates into a macrophage.

noun

a type of granular leukocyte that functions in the ingestion of bacteria