pseudomembranePronunciation: /ˌsjuːdəʊˈmɛmbreɪn/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 pseudomembranous adjective pseudomembrane in other Oxford dictionaries Definition of pseudomembrane in the US English dictionary