You can find definition of rem below. Words can have several meanings depending on the context. Their meaning may vary depending on where they are used. Please choose approriate definition according to part of speech and context. We have found 2 different definitions of rem. rem is a 3 letter word. It starts with r and ends with m.
a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
(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