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Medical Definition of Phagocytic index
1. The average number of bacteria observed in the cytoplasm of polymorphonuclear leukocytes after mixing and incubating, at 37°C, 1) a suspension of washed, presumably normal leukocytes, 2) the serum to be tested for opsonin, and 3) a young culture of microorganisms that are causing disease in the patient. Origin: L. Phagedaena, Gr Phago, To eat. (05 Mar 2000)