defiladePronunciation: /ˌdɛfɪˈleɪd/ MilitaryDefinition of defilade noun [mass noun] the protection of forces against enemy observation or gunfire. verb [with object] protect (forces) against enemy observation or gunfire: (as adjective defiladed)a defiladed tankOrigin: early 19th century: from French défiler 'protect from the enemy' + -ade1defilade in other Oxford dictionaries Definition of defilade in the US English dictionary