Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for vaccine from the 1913 edition of Webster's Revised Unabridged Dictionary. Define vaccine using one of the most comprehensive free online dictionaries on the web.

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vaccine
Part of Speech: noun
Results: 2
2. any preparation used to render an organism immune to some disease, by inducing or increasing the natural immunity mechanisms. Prior to 1995, such preparations usually contained killed organisms of the type for which immunity was desired, and sometimes used live organisms having attenuated virulence. since that date, preparations containing only specific antigenic portions of the pathogenic organism are also used, some of which are prepared by genetic engineering techniques.
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