the GNU version of the Collaborative International Dictionary of English
adj. Pertaining to, or connected with, diphtheria.
adj. Having characteristics resembling those of diphtheria.
The Century Dictionary and Cyclopedia
Of the nature of, pertaining or relating to, or affected by diphtheria: as, diphtheritic laryngitis; a diphtheritic membrane; a diphtheritic patient.
Word Usage
"Many of the best physicians of the day consider true or membranous croup to be due to this diphtheritic membranous disease thus located in the larynx or trachea."