Home › Words › V › vacciolationvacciolationvacciolation means innoculation with cowpox (the vacciolous virus) in order to provide immunity from smallpox.Among words judged in Lexicurio's Arena, vacciolation ranks #16,733 of 42,747 for Qualifying.EtymologyCoined by Dr. John Walker in 1802 from vacciolate + -ion.nounInnoculation with cowpox (the vacciolous virus) in order to provide immunity from smallpox.Definitions & examples from Wiktionary (CC BY-SA 3.0).