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 human beings.

• 单核细胞一种循环巨噬白血细胞，生有一个界线分明的核，在细胞浆中有微小颗粒。单核细胞占人体白血细胞的3%25到8%25