Noun
any of several hemolysins derived from strains of streptococcus
Source: WordNetStreptolysin, an exotoxin, is the enzyme produced by the bacteria which causes the complete lysis of red blood cells. Source: Internet
There are two types of streptolysin: Streptolysin O (SLO) and streptolysin S (SLS). Source: Internet
Streptolysin S is an oxygen-stable cytotoxin also produced by most GAS strains which results in clearing on the surface of blood agar. Source: Internet