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Definition of Nightmare
1. Noun. A situation resembling a terrifying dream.
2. Noun. A terrifying or deeply upsetting dream.
Definition of Nightmare
1. n. A fiend or incubus formerly supposed to cause trouble in sleep.
Definition of Nightmare
1. Noun. (rare) A female demon or monster, thought to plague people while they slept and cause a feeling of suffocation and terror during sleep. ¹
2. Noun. A very bad or frightening dream. ¹
3. Noun. (figuratively) Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure. ¹
¹ Source: wiktionary.com
Definition of Nightmare
1. [n -S]
Medical Definition of Nightmare
1. 1. A fiend or incubus formerly supposed to cause trouble in sleep. 2. A condition in sleep usually caused by improper eating or by digestive or nervous troubles, and characterised by a sense of extreme uneasiness or discomfort (as of weight on the chest or stomach, impossibility of motion or speech, etc), or by frightful or oppressive dreams, from which one wakes after extreme anxiety, in a troubled state of mind; incubus. 3. Hence, any overwhelming, oppressive, or stupefying influence. Origin: Night + mare incubus. See Mare incubus. Source: Websters Dictionary (01 Mar 1998)