demyelinate Syllabification: (de·my·e·li·nate)Pronunciation: /dēˈmīələˌnāt/Definition of demyelinate verb [with object] (usually as adjective demyelinating) Medicine cause the loss or destruction of myelin in (nerve tissue):a chronic demyelinating diseaseDerivatives demyelinationPronunciation: /-ˌmīəliˈnāSHən/ noun demyelinate in other Oxford dictionaries Definition of demyelinate in the British & World English dictionary