a bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen
complement 5
noundomain: substance
Princeton WordNet [ver.3.1]
English
Definition
one of a series of enzymes in the blood serum that are part of the immune response
a bodily defense reaction that recognizes an invading substance (an antigen: such as a virus or fungus or bacteria or transplanted organ) and produces antibodies specific against that antigen