Medical Dictionary

nightmare

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

Medical Definition of NIGHTMARE

:  a frightening or distressing dream that usually awakens the sleeper
April 28, 2015
portmanteau Hear it
a word formed by the blending of words
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears