Hypertext Webster Gateway: "vaccine"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Vaccine \Vac"cine\, a. [L. vaccinus, fr. vacca a cow; cf. Skr.
v[=a]c to bellow, to groan.]
Of or pertaining to cows; pertaining to, derived from, or
caused by, vaccinia; as, vaccine virus; the vaccine disease.
-- n. The virus of vaccinia used in vaccination.
From WordNet (r) 1.7 (wn)
vaccine
n : immunogen consisting of a suspension of weakened or dead
pathogenic cells injected in order to stimulate the
production of antibodies
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