|1.||a terrifying or deeply distressing dream|
|2.||a. an event or condition resembling a terrifying dream: the nightmare of shipwreck|
|b. (as modifier): a nightmare drive|
|3.||a thing that is feared|
|4.||(formerly) an evil spirit supposed to harass or suffocate sleeping people|
|[C13 (meaning: incubus; C16: bad dream): from |
nightmare night·mare (nīt'mâr')
A dream arousing feelings of intense fear, horror, and distress.
An event or experience that is intensely distressing.