rem

Noun
  1. A recurring sleep state during which dreaming occurs;
    A state of rapidly shifting eye movements during sleep (synset 114049226)
    is a type of: sleep, slumber - a natural and periodic state of rest during which consciousness of the world is suspended
    same as: paradoxical sleep, rapid eye movement, rapid eye movement sleep, rem sleep
  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 (synset 113667846)
    is a type of: radioactivity unit - a measure of radioactivity

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