| the average number of bacteria ingested per phagocyte in an incubated mixture of bacteria, phagocytes, and blood serum: used in determining the opsonic index. |

| phagocytic index n. The average number of bacteria ingested by each phagocyte in an individual's blood after a mixture of the blood serum, bacteria, and phagocytes has been incubated. |
phagocytic index n.
The average number of bacteria observed in the cytoplasm of neutrophils after a mixture of blood serum, bacteria, and neutrophils has been incubated.