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The Collaborative International Dictionary of English v.0.48 (gcide)

Vaccine \Vac"cine\ (v[a^]k"s[imac]n or v[a^]k"s[i^]n; 277), a.
[L. vaccinus, fr. vacca a cow; cf. Skr. v[=a][,c] to bellow,
to groan.]
1. Of or pertaining to cows; pertaining to, derived from, or
caused by, vaccinia; as, vaccine virus; the vaccine
disease.
[1913 Webster]

2. Of or pertaining to a vaccine or vaccination.
[PJC]


Vaccine \Vac"cine\ (v[a^]k*s[=e]n" or v[a^]k"s[=e]n), n.
1. The virus of vaccinia used in vaccination.
[1913 Webster]

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 have also been used. Some of these are
prepared by genetic engineering techniques.
[PJC]

3. (Computers) A program designed to protect a computer from
software viruses, by detecting and or eliminating them.
[PJC]