Webster's English Dictionary

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antitoxin

an.ti.tox.in \.ant-i-'ta:k-s*n\ n [ISV] : an antibody formed in the body as 
   a result of the introduction of a toxi n and capable of neutralizing the 
   specific toxin that stimulated its production and produced commercially in 
   animals by injection of a toxin or toxoid (as of human disease) with the 
   resulting serum being used to counteract the toxin in other individuals