Noun has 2 senses

• rem(n = noun.state) paradoxical sleep, rapid eye movement, rapid eye movement sleep, rem sleep - a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep;


• rem(n = noun.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;