English noun: REM | |||
1. | REM (state) a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep | ||
Synonyms | paradoxical sleep, rapid eye movement, rapid eye movement sleep, REM sleep | ||
Broader (hypernym) | sleep, slumber | ||
2. | REM (quantity) (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 | ||
Broader (hypernym) | radioactivity unit | ||