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VACCINE Dorland's Pocket Medical Dictionary A suspension of attenuated or killed microorganisms (viruses, bacteria, or rickettsiae), administered for prevention, amelioration or treatment of infectious diseases Stedman's medical Dictionary (26th Edn.) Originally, the live v. (vaccinia, cowpox) virus inoculated in the skin as prophylaxis against, smallpox and obtained from the skin of calves inoculated with seed virus. Usage has extended the meaning to include essentially any preparation intended for active immunological prophylaxis; e.g. preparations of killed microbes of virulent strains or living microbes of attenuated (variant or mutant) strains; or microbial, fungal, plant, protozoal, or metazoan derivatives or products. Method of administration varies according to the v., inoculation being the most common, but ingestion is preferred in some instances and nasal spray is used occasionally, SYN vaccinum. [L. vaccinus, relating to a cow].
The Condensed Chemical Dictionary (10th Edn.) Not mentioned Webster's New 20th Century Dictionary   The Shorter Oxford English Dictionary A preparation of some virus used for the purpose of inoculation (1) Virus of cowpox used in vaccination (2) The characteristic virus of cow-pox (obtained directly or from human subjects) which is employed in vaccination Collins English Dictionary (1) A suspension of dead, attenuated, or otherwise modified microorganisms (viruses, bacteria, or rickettsiae) for inoculation to produce immunity to a disease by stimulating the production of antibodies (2) A preparation of the virus of cowpox taken from infected cows and inoculated in men to produce immunity to smallpox (3) (modifier) of or relating to vaccination or vaccinia McGraw Hill Dictionary of Scientific and Technical Terms A suspension of killed or attenuated bacteria or viruses or fractions thereof, injected to produce active immunity Chambers 20th Century Dictionary (adj.) Of, derived from, the cow; of vaccina: of vaccination.
(n) Cowpox virus or lymph containing it: any preparation used to confer immunity to a disease by inoculation The Oxford Reference Dictionary
(n) A preparation of cowpox virus introduced into the bloodstream to procure immunity against smallpox (2) Any preparation of an organism or substance causing a disease, specially treated or synthesized and injected or administered orally against an infection The Chambers Dictionary [New Edn.] (1)Any preparation containing dead or attenuated microorganisms, eg viruses or bacteria, used to confer immunity to a disease by inoculation (2) Cowpox virus or lymph containing it, used for inoculation against smallpox (3) Chambers English Dictionary (1) Cowpox virus or lymph containing it (2) Any preparation used to confer immunity to a disease by inoculation Merriam Webster's New Collegiate Dictionary -

Tenth Edition Mater or a preparation containing the virus of cowpox in a form used for vaccination (2) A preparation of killed microorganisms, living attenuated organisms or living fully virulent organisms that is administered to produce or artificially increase immunity to a particular disease Webster's Encyclopedic Unabridged Dictionary of the English Language [New Revised Edition] (1) The virus of cowpox, used in vaccination, obtained from the vesicles of a cow or person having the disease (2) the modified virus of any of various other diseases, used for preventive inoculation