sozine

noun

1. (obsolete)An antiseptic substance; any protein normally contained in the body of an animal and forming a natural protection against germs.

   “These albuminous substances, whether found as normal products or created artificially in the blood, are distinguished as antitoxins, protective proteïds, vaccines, or alexines; physiologically they have been divided into sozines, those found in animals naturally immune, and phylaxines, those found in animals which by subcutaneous injections have artificially been made immune.”