pseudomembrane Syllabification: (pseu·do·mem·brane)Pronunciation: /ˌso͞odōˈmemˌbrān/Definition of pseudomembrane noun Medicine a layer of exudate resembling a membrane, formed on the surface of the skin or of a mucous membrane, especially the conjunctiva. Derivatives pseudomembranousPronunciation: /-ˈmembrənəs/ adjective pseudomembrane in other Oxford dictionaries Definition of pseudomembrane in the British & World English dictionary