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Meaning of vaccinia

vac•cin•i•a

Pronunciation: (vak-sin'ē-u), [key]
— n.
  1. a variant of the cowpox virus that became established in vaccines derived from cowpox-inoculated humans.
  2. an acute infection caused by inoculation with vaccinia virus as a prophylactic against smallpox, characterized by localized pustular eruptions.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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