Definition of phylaxis in English:

phylaxis

Pronunciation /fʌɪˈlaksɪs/

noun

rare Biology
  • The immunological protection of the body against infection.

Origin

Early 20th century. From ancient Greek ϕύλαξις watching, guarding, a security from ϕυλακ-, stem of ϕυλάσσειν to guard + -σις, after French phylaxie.