REM

Từ điển Oxford Learners Wordfinder Dictionary

noun

1. a recurring sleep state during which dreaming occurs;
a state of rapidly shifting eye movements during sleep
• Syn:
paradoxical sleep, rapid eye movement sleep, REM sleep, rapid eye movement
• Hypernyms:
sleep, slumber
2. (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
• Hypernyms:
radioactivity unit