An antibody that inhibits or prevents the effects of streptolysin O elaborated by group A streptococci; the amount of a. in the serum is frequently increased during and after streptococcal disease, and comparative titers may be a diagnostic and prognostic aid.
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an·ti·strep·to·ly·sin -.strep-tə-'līs-ən n an antibody against a streptolysin produced by an individual injected with a streptolysin-forming streptococcus
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an·ti·strep·tol·y·sin (an″te-) (an″ti-strep-tolґĭ-sin) an antibody that inhibits streptolysin.Medical dictionary. 2011.