Backfischaquarium

== German == === Etymology === Backfisch +‎ Aquarium === Pronunciation === IPA(key): /ˈbakfɪʃʔaˌkvaːʁiʊm/ === Noun === Backfischaquarium n (strong, genitive Backfischaquariums, plural Backfischaquarien) (dated slang) synonym of Mädchenpensionat (“girls' boarding school”) ==== Declension ====