1) Hemolysin 
<immunology> An antibody which can combine both with a cellular antigen (such as a virus or bacterium) and with a complement because it has two combining elements. ... (09 Oct 1997) ... 
Type: Term Pronunciation: am′bō-sep′tŏr Definitions: 1. Ehrlich's term for his concept, now obsolete, of the structure of complement-fixing antibody; now used chiefly to denote the anti-sheep erythrocyte antibody used in the hemolytic system of complement-fixation tests.
amboceptor 1. Denotes the anti-sheep red blood cell antibody used in complement fixation tests. 2. In bacteriology, an antibody able to damage or destroy a microorganism or other cell by connecting complement to it. 3. A substance that when added to another breaks down red blood cells.
hemolysin.