Donaudampfschiffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft
Donaudampfschiffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft is a compound word that serves as an example of the virtually unlimited compounding of nouns that is possible in many Germanic languages. According to the 1996 "Guinness Book of World Records", it is the longest word published in the German language.
Longest words
The Bulgarian online etymological dictionary claims that longest word in Bulgarian to be the 39-letter-long ("), introduced in the Constitution of Bulgaria of 1947 (Dimitrov Constitution). The word means "do not perform actions against the constitution" (addressed to more than one person).