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The twitching movements of the eye muscles and other physiological changes that occur during REM sleep.
[r(apid) e(ye) m(ovement).]
1. The amount of ionizing radiation required to produce the same biological effect as one rad of high-penetration x-rays.
2. A unit for measuring absorbed doses of radiation, equivalent to one roentgen of x-rays or gamma rays.
[r(oentgen) e(quivalent in) m(an).]
(Physiology) rapid eye movement
n acronym for
(General Physics) roentgen equivalent man
the quantity of ionizing radiation whose biological effect is equal to that produced by one roentgen of x-rays.
[1945–50; r(oentgen)e(quivalent in)m(an)]
Short for rapid eye movement. A stage of sleep characterized by twitching movements of the muscles of the eyes and face, faster heartbeat, and increased circulation to the brain. Dreaming takes place during REM sleep.
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|Noun||1.||REM - a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep|
|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