Home › Words › T › theileriasistheileriasistheileriasis · noun — infection with Theileria parasites.Definition from Wiktionary (CC BY-SA 3.0).Among words judged in Lexicurio's Arena, theileriasis ranks #40,962 of 42,866 for Qualifying.EtymologyFrom Theileria + -iasis.nouninfection with Theileria parasitesDefinitions & examples from Wiktionary (CC BY-SA 3.0).