WordReference Random House Unabridged Dictionary of American English © 2025
rap′id eye′ move′ment. 
  1. Physiologyrapidly shifting, continuous movements of the eyes beneath closed lids during the stage of sleep characterized by dreaming. Also called REM 
  • 1915–20

Collins Concise English Dictionary © HarperCollins Publishers::
rapid eye movement
  1. movement of the eyeballs under closed eyelids during paradoxical sleep, which occurs while the sleeper is dreaming
    Abbreviation: REM
'rapid eye movement' also found in these entries (note: many are not synonyms or translations):
NREM - REM - rapid eye movement sleep - rem

Forum discussions with the word(s) "rapid eye movement" in the title:


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