Definition of "diphtheritic" [diph•the•rit•ic]

• Resembling or related to diphtheria. (adjective)

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• "Yet to-day we have people who do not believe in vaccination or in anti-diphtheritic serum."
• "The difficulty here again is that if we wait till the diphtheritic membrane covers the whole throat, antitoxin will not be of much use."
• "It is called "false" croup, because "true" croup is always diphtheritic and is a very serious disease."