noun \dif-ˈthir-ē-ə, dip-\

Definition of DIPHTHERIA

: an acute febrile contagious disease typically marked by the formation of a false membrane especially in the throat and caused by a bacterium of the genus Corynebacterium (C. diphtheriae) which produces a toxin causing inflammation of the heart and nervous system
diph·the·ri·al \-ē-əl\ adjective

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