n 1  :  a group or set (as of chromosomes or DNA) that is typical of the complete organism or one of its parts - see CHROMOSOME COMPLEMENT   2  :  a complementary color  3  :  the thermolabile group of proteins in normal blood serum and plasma that in combination with antibodies causes the destruction esp. of particulate antigens (as bacteria and foreign blood corpuscles) .
 
 
 
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