Dictionary

nightmare

nightmare

noun night·mare \ˈnīt-ˌmer\

: a dream that frightens a sleeping person : a very bad dream

: a very bad or frightening experience or situation

Full Definition of NIGHTMARE

1
:  an evil spirit formerly thought to oppress people during sleep
2
:  a frightening dream that usually awakens the sleeper
3
:  something (as an experience, situation, or object) having the monstrous character of a nightmare or producing a feeling of anxiety or terror
nightmare adjective
night·mar·ish \-ˌmer-ish\ adjective
night·mar·ish·ly adverb

Examples of NIGHTMARE

  1. Mommy, I had a really scary nightmare.
  2. The party was a complete nightmare.

Origin of NIGHTMARE

Middle English, from 1night + 1mare
First Known Use: 14th century

nightmare

noun night·mare \ˈnīt-ˌma(ə)r, -ˌme(ə)r\   (Medical Dictionary)

Medical Definition of NIGHTMARE

:  a frightening or distressing dream that usually awakens the sleeper

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