(văk-sēnʹ văkʹsēn´) noun. 1. a. A preparation of a weakened or killed pathogen, such as a bacterium or virus, or of a portion of the pathogen's structure that upon administration stimulates antibody production against the pathogen but is incapable of causing severe infection. b. A vaccine prepared from the cowpox virus and inoculated against smallpox. 2. Computer Science. Software designed to detect and stop the progress of a computer virus, vaksin
vaccine noun. substance used in vaccination. vaksin; (colloquial) benih cacar.