| 1. | a terrifying dream in which the dreamer experiences feelings of helplessness, extreme anxiety, sorrow, etc. |
| 2. | a condition, thought, or experience suggestive of a nightmare: the nightmare of his years in prison. |
| 3. | (formerly) a monster or evil spirit believed to oppress persons during sleep. |
nightmare night·mare (nīt'mâr')
n.
A dream arousing feelings of intense fear, horror, and distress.
An event or experience that is intensely distressing.