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Definition of Complement system
1. Noun. (context: immunology) An aspect of the innate immune system that supplements the actions of the antibodies and phagocytic cells in clearing out pathogens from an organism. ¹
¹ Source: wiktionary.com
Medical Definition of Complement system
1. A group of more than 20 serum proteins, some of which can be serially activated and participate in a cascade resulting in cell lysis. (05 Mar 2000)