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Noun: nightmare  'nIt,mehr
  1. A terrifying or deeply upsetting dream
    "He woke up in a cold sweat after experiencing a nightmare";
    - ephialtes [archaic]
     
  2. A situation resembling a terrifying dream
    "The traffic jam was a nightmare for commuters";
    - incubus

Derived forms: nightmares

Type of: dream, dreaming, situation

Encyclopedia: Nightmare