nightmare

[ nahyt-mair ]
/ ˈnaɪtˌmɛər /

noun

a terrifying dream in which the dreamer experiences feelings of helplessness, extreme anxiety, sorrow, etc.
a condition, thought, or experience suggestive of a nightmare: the nightmare of his years in prison.
(formerly) a monster or evil spirit believed to oppress persons during sleep.

VIDEO FOR NIGHTMARE

WATCH NOW: The Suffocating History Behind The Word "Nightmare"

It's dark. You're alone. Was that a footstep? Did something just brush up against you? You fight to get up, but you're stuck ... right on top of you is a horrifying nightmare. Sorry, did you say a nightmare was on top of me?

MORE VIDEOS FROM DICTIONARY.COM

Origin of nightmare

Middle English word dating back to 1250–1300; see origin at night, mare2

synonym study for nightmare

1. See dream.

Example sentences from the Web for nightmare

British Dictionary definitions for nightmare

nightmare
/ (ˈnaɪtˌmɛə) /

noun

a terrifying or deeply distressing dream
  1. an event or condition resembling a terrifying dreamthe nightmare of shipwreck
  2. (as modifier)a nightmare drive
a thing that is feared
(formerly) an evil spirit supposed to harass or suffocate sleeping people

Derived forms of nightmare

nightmarish, adjective nightmarishly, adverb nightmarishness, noun

Word Origin for nightmare

C13 (meaning: incubus; C16: bad dream): from night + Old English mare, mære evil spirit, from Germanic; compare Old Norse mara incubus, Polish zmora, French cauchemar nightmare

Medical definitions for nightmare

nightmare
[ nītmâr′ ]

n.

A dream arousing feelings of intense fear, horror, and distress.
An event or experience that is intensely distressing.