German orthography
Compound words, including nouns, are written together, e.g. "Haustür" (Haus+Tür; house door), "Tischlampe" (Tisch+Lampe; table lamp), "Kaltwasserhahn" (Kalt+Wasser+Hahn; cold water tap/faucet). This can lead to long words: the longest word in regular use, "Rechtsschutzversicherungsgesellschaften" ("legal protection insurance companies"), consists of 39 letters; while the longest German word ever published ("Donaudampfschiffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft", "Association for subordinate officials of the head office management of the Danube steamboat electrical services") has 79 letters.
German orthography
In 1880, Gymnasium director Konrad Duden published the "Vollständiges Orthographisches Wörterbuch der deutschen Sprache" ("Complete Orthographic Dictionary of the German Language"), known simply as "the Duden". In the same year, the Duden was declared to be authoritative in Prussia. Since Prussia was, by far, the largest state in the German Empire, its regulations also influenced spelling elsewhere, for instance, in 1894, when Switzerland recognized the Duden.