autohemolysin
noun
au·to·he·mo·ly·sin
variants:
or chiefly British autohaemolysin \ ˌȯt-ō-ˌhē-mə-ˈlīs-ᵊn 
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Medical Definition of autohemolysin
: a hemolysin that acts on the red blood cells of the individual in whose blood it is found