rem

Other Definitions
rem (enc)

Noun	1.	REM - a recurring sleep state during which dreaming occurs; a state of Rapid Eye Movements during sleep paradoxical sleep, rapid eye movement, rapid eye movement sleep, REM 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"
	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

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