Portuguese word vacina comes from Proto-Indo-European *wokeha-, Proto-Indo-European *wokeh₂-, Proto-Indo-European *wokeh₂, and later Latin vacca (Cow (female cattle).)
*wokeha- (Proto-Indo-European)
*wokeh₂- (Proto-Indo-European)
*wokeh₂ (Proto-Indo-European)
vacca (Latin)
Cow (female cattle).
vaccinus (Latin)
Of or derived from a cow; cow- (attributive).
vacina (Portuguese)
Vaccine.
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