1. (noun) paradoxical sleep, rapid eye movement sleep, REM sleep, rapid eye movement, REM
a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
Synonyms: rapid eye movement, paradoxical sleep, rapid eye movement sleep
2. (noun) REM
(Roentgen Equivalent Man) the dosage of ionizing radiation that will cause the same amount of injury to human tissue as 1 roentgen of X-rays
Synonyms: rapid eye movement, paradoxical sleep, rapid eye movement sleep
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Synonyms for rem 
