wafer-thinEnglishOxford New American Dictionarywafer-thin /ˈˌwāfər ˈTHin, ˈˌweɪfər ˈθɪn / ▸ adjective very thin: a single slice of wafer-thin ham. ▪ (especially of a margin of victory) very slim; barely achieved: the party secured a wafer-thin majority of 36 success in sport rests on this wafer-thin margin.