Alclad Syllabification: (Al·clad)Pronunciation: /ˈalˌklad/Definition of Alclad noun ( trademark in the UK) a composite material consisting of sheets of aluminum alloy coated with pure aluminum or a different alloy to increase corrosion resistance. Origin: 1920s: from al(uminum) + clad1Alclad in other Oxford dictionaries Definition of Alclad in the British & World English dictionary