rem C2 Topic:General Vocabulary US /rɛm/ UK /rɛm/ See IPA manual Freq #21969 Meanings 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. 2 noun rapid eye movement, especially the stage of sleep associated with vivid dreaming Most vivid dreaming occurs during REM sleep. Thesaurus Synonyms 2 noun · rapid eye movement,... rapid eye movementREM sleep Word family Forms rems Derived forms millirem Related forms sievertradroentgenradiationREM sleep 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. Topics General Vocabulary External links Google Images Cambridge Dictionary Wiktionary # rem **Type:** Word **Level:** C2 **Part of speech:** noun **IPA (US):** /rɛm/ **IPA (UK):** /rɛm/ **Frequency rank:** 21969 ## Meanings 1. a non-SI unit of radiation dose equivalent equal to 0.01 sievert 2. rapid eye movement, especially the stage of sleep associated with vivid dreaming ## Examples - The safety report expressed each worker's annual dose in rem. - Most vivid dreaming occurs during REM sleep. ## Derived Forms - millirem ## Related Forms - sievert - rad - roentgen - radiation - REM sleep ## 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. ## Topics - General Vocabulary markdown