vaccine

n. solution of weakened or modified pathogen cells which is injected into the body in order to stimulate the production of antibodies to a disease, inoculation; (Computers) program that is designed to protect against computer viruses

adj. of or pertaining to vaccine; of or pertaining to vaccinia; derived from cows

A vaccine is an antigenic preparation used to establish immunity to a disease. The term derives from Edward Jenner's use of cowpox ("vacca" means cow in Latin), which, when administered to humans, provided them protection against smallpox, the work which Louis Pasteur and others carried on. Vaccines are based on the concept of variolation originating in China, in which a person is deliberately infected with a weak form of smallpox. Jenner realized that milkmaids who had contact with cowpox did not get smallpox. The process of distributing and administrating vaccines is referred to as vaccination. Since vaccination was much safer, smallpox inoculation fell into disuse and was eventually banned in England in 1840.
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Noun
1. immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies
(synonym) vaccinum
(hypernym) immunogen, immunizing agent
(hyponym) DPT vaccine
(derivation) immunize, immunise, inoculate, vaccinate

n. vaccine, solution of weakened or modified pathogen cells which is injected into the body in order to stimulate the production of antibodies to a disease; program that is designed to protect against computer viruses; cowpox

adj. vaccinated, injected, inoculated

v. vaccinate, inoculate, inject

n. vaccine, solution of weakened or modified pathogen cells which is injected into the body in order to stimulate the production of antibodies to a disease