The Collaborative International Dictionary
Diphtheritic
Diphtheritic \Diph`the*rit"ic\, a. (Med.)
Pertaining to, or connected with, diphtheria.
Having characteristics resembling those of diphtheria; as, diphtheritic inflammation of the bladder.
Wiktionary
diphtheritic
a. (context medicine English) Resembling or related to diphtheria.