Danysz phenomenon
noun
Da·nysz phenomenon
| \ ˈdän-ish-
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Medical Definition of Danysz phenomenon
: the exhibition of residual toxicity by a mixture of toxin and antitoxin in which the toxin has been added in several increments to an amount of antitoxin sufficient to completely neutralize it if it had been added as a single increment
— called also Danysz effect