Definition from Wiktionary, the free dictionary
- First element cauche, from Old French verb from cache, from cauchier (“to press”), from Latin calcō (“trample, tread on”).
- Second element mar, from Middle Dutch mare (“phantom, spirit, nightmare”), from Proto-Germanic *marǭ (“nightmare, incubus”), from Proto-Indo-European *mor- (“malicious female spirit”), related to English homograph mare. More at mare.
- IPA: /kɔʃ.maʁ/, /koʃ.maʁ/, X-SAMPA: /kOS.maR/, /koS.maR/
Audio (France, Paris) (file)
- Homophone: cauchemars
- Hyphenation: cauche‧mar
cauchemar m (plural cauchemars)
Derived terms 
- Esperanto: koŝmaro (borrowed)
- Estonian: košmaar (borrowed)
- Macedonian: кошмар (borrowed)
- Polish: koszmar (borrowed)
- Romanian: coșmar (borrowed)
- Russian: кошмар (borrowed)
- Serbo-Croatian: košmar, кошмар (borrowed)