Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun rem

2 senses of rem

Sense 1
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)
       => sleep, slumber -- (a natural and periodic state of rest during which consciousness of the world is suspended; "he didn't get enough sleep last night"; "calm as a child in dreamless slumber")

Sense 2
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)
       => radioactivity unit -- (a measure of radioactivity)