German

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German Wikipedia has an article on:
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Alternative forms

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Etymology

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Kopf (head) +‎ Nuss (nut)

Pronunciation

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  • IPA(key): /ˈkɔpfnʊs/
  • Audio:(file)

Noun

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Kopfnuss f (genitive Kopfnuss, plural Kopfnüsse)

  1. clout (blow on the head)
  2. (figurative) riddle, brain-teaser

Usage notes

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  • The spelling Kopfnuss has been the prescribed spelling since the German spelling reform of 1996 (the Rechtschreibreform). In Switzerland and Liechtenstein, it had already been standard since ⟨ß⟩ was deprecated in the 1930s.

Declension

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Further reading

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  • Kopfnuss” in Duden online
  • Kopfnuss” in Digitales Wörterbuch der deutschen Sprache