n.
Pronunciation: vak- ' s ē n, ' vak- ˌ
Function: noun
Etymology: French vaccin, from vaccine cowpox, from New Latin vaccina (in variolae vaccinae cowpox), from Latin, feminine of vaccinus, adjective, of or from cows, from vacca cow; akin to Sanskrit va ś a cow
Date: 1813
: 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
– vaccine adjective