nightmare (English)

Where does "nightmare" come from?

The English noun 'nightmare' derives from Middle English 'night-mare'[1], which traces back to an unattested Old English compound '*nihtmare'[1][2]. This word descends from Proto-West Germanic '*nahtmarā'[2], formed by joining the elements for 'night' and an oppressive entity[4]. The second element derives via Proto-Germanic '*marǭ'[6] from the Proto-Indo-European root '*mer-', meaning 'to die', which yielded '*mor-', a term for a malicious female spirit[8]. Originally referring to a folklore demon believed to torment and suffocate sleeping people, the word gradually shifted in meaning to describe the terrifying dreams and distressing feelings associated with such nocturnal visitations.

Open questions

• The Old English compound form '*nihtmare' is an unattested reconstruction rather than a directly documented word. [1] [2] [3]
• The ultimate origin of the Proto-Indo-European root for night is debated, with scholars offering contrasting views on whether it represents simple ablaut variants or derives from a root meaning bare or naked. [9]

Full etymology tree

• nightmare (English), 'A very unpleasant or frightening dream.'
  • inherited night-mare (Middle English), 'An evil spirit attacking men or horses at night.'
    • inherited *nihtmare (Old English), 'mare (evil spirit thought to torment people in their sleep)'
      • inherited *nahtmarā (Proto-West Germanic), 'nightmare'
        • compound *naht (Proto-West Germanic), 'night'
          • inherited *nahts (Proto-Germanic), 'night'
            • inherited *nókʷts (Proto-Indo-European), 'night (or possibly 'evening')'
        • compound *marā (Proto-West Germanic), 'evil spirit, nightmare'
          • inherited *marǭ (Proto-Germanic), 'nightmare'
            • inherited *mor- (Proto-Indo-European)
              • derived *mer- (Proto-Indo-European), 'to die'

Ancestors

• *mer- (Proto-Indo-European)
• night-mare (Middle English)
• *nihtmare (Old English)

Cognates and doublets

• nachtmerrie (Dutch)
• Nachtmahr (German)

Descendants and derived words

• daymare (English)
• daymare (English)
• flightmare (English)
• frightmare (English)
• knightmare (English)
• logistical nightmare (English)
• mid-nightmare (English)
• mid-nightmare (English)
• midnightmare (English)
• morningmare (English)
• nightmare fuel (English)
• nightmarelike (English)

Sources

1. nightmare (English) - Wiktionary
2. nihtmare (Old English) - Wiktionary
3. night-mare (Middle English) - Wiktionary
4. nahtmarā (Proto-West Germanic) - Wiktionary
5. naht (Proto-West Germanic) - Wiktionary
6. marā (Proto-West Germanic) - Wiktionary
7. nahts (Proto-Germanic) - Wiktionary
8. marǭ (Proto-Germanic) - Wiktionary
9. nókʷts (Proto-Indo-European) - Wiktionary

Updated September 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris