Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Food, Babieszwiebackzwie‧back /ˈzwiːbæk $ ˈzwaɪ-/ noun [uncountable] American EnglishDFDHB a type of hard dry bread, often given to babies SYN rusk British EnglishOrigin zwieback (1800-1900) German “twice baked” ldoceonline.com