I. (ˈ)vak|sēn sometimes ˈvaksə̇n adjective
Etymology: Latin vaccinus of or from cows, from vacca cow + -inus -ine; akin to Sanskrit vaśa cow
1. : of, relating to, or derived from cows ; especially : derived from cows infected with cowpox or inoculated with its virus
vaccine lymph
2.
[New Latin vaccinus, from Latin]
: of or relating to vaccinia or vaccination
a vaccine pustule
II. noun
( -s )
1. : matter or a preparation containing the virus of cowpox or vaccinia 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 — compare antigen , serum