Definitions from Wiktionary ( )

▸ adjective:  (historical)
▸ adjective:  (medicine) Of, pertaining to, caused by, or characteristic of cowpox.
▸ adjective:  (immunology) Of or pertaining to cowpox as a source of material for vaccination against smallpox; also, of or pertaining to such material used for vaccination.
▸ adjective:  (archaic) Of, pertaining to, or derived from cattle.
▸ noun:  (immunology)
▸ noun:  A substance given to stimulate a body's production of antibodies and provide immunity against a disease without causing the disease itself in the treatment, prepared from the agent that causes the disease (or a derivative of it; or a related, also effective, but safer disease), or a synthetic substitute; also, a dose of such a substance.
▸ noun:  The process of vaccination; immunization, inoculation.
▸ noun:  (historical) material taken from cowpox pustules used for vaccination against smallpox.
▸ noun:  (also medicine, obsolete) The disease cowpox, especially as a source of material for vaccination against smallpox.
▸ noun:  (figuratively)
▸ noun:  Something defensive or protective in nature, like a vaccine (sense 1.1).
▸ noun:  (computing) A software program which protects computers against, or detects and neutralizes, computer viruses and other types of malware; an antivirus.
▸ verb:  (transitive, archaic) Synonym of vaccinate (“to treat (a person or an animal) with a vaccine to produce immunity against a disease”)

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