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Definition of Alexin
1. a substance in the blood that aids in the destruction of bacteria [n -S]
Medical Definition of Alexin
1. An obsolete term for the bactericidal substances of cell-free serum, the activity of which is destroyed by heating at 56°C; applied by Bordet to the heat-labile substance normally present in serum and distinct from the sensitizing substance (antibody) produced by infection or immunization. In this sense it is synonymous with complement. Origin: G. Alexo, to ward off (05 Mar 2000)