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1. (n.) rem
the quantity of ionizing radiation whose biological effect is equal to that produced by one roentgen of x-rays.
Etymology: (1955–60)
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Princeton's WordNet |
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1. (noun) paradoxical sleep, rapid eye movement sleep, REM sleep, rapid eye movement, REM
a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
2. (noun) 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
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Definitions of rem 
