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.
Jacob Wackernagel
Another law named after him (Wackernagel 1889) is Wackernagel's law of lengthening ("Dehnungsgesetz" in German), also sometimes known as the law of lengthening in composition ("Regelung der Dehnung in der Zusammensetzung"): in some compound words in Greek the first ingredient ends with a vowel and the second ingredient begins with a vowel; when "neither vowel is high" the first vowel is without effect and the second is replaced by its long counterpart.