Etymology
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vaccine (n.)

"matter used in vaccination," 1846, from French vaccin, noun use of adjective, from Latin vaccina, fem. of vaccinus "pertaining to a cow" (see vaccination). Related: Vaccinal; vaccinic.

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Definitions of vaccine

vaccine (n.)
immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies;
Synonyms: vaccinum
From wordnet.princeton.edu