Meanings
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1
noun
a non-SI unit of radiation dose equivalent equal to 0.01 sievert
The safety report expressed each worker's annual dose in rem.
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2
noun
rapid eye movement, especially the stage of sleep associated with vivid dreaming
Most vivid dreaming occurs during REM sleep.
Thesaurus
Etymology
The radiation unit is an acronym of roentgen equivalent man. The sleep term is an initialism of rapid eye movement. These unrelated formations share the same pronunciation.