There are 2 definitions of REM in English:


Syllabification: REM


  • Rapid eye movement.

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
elaborate ornamentation of a vocal melody

There are 2 definitions of REM in English:


Syllabification: rem

noun (plural same)

  • A unit of effective absorbed dose of ionizing radiation in human tissue, equivalent to one roentgen of X-rays.
    More example sentences
    • The modern international system of units includes the Gray, the Sievert, and the Becquerel (Bq); these replace the rad, rem, and Curie, respectively.
    • According to Badhwar, the total increase in cosmonaut exposure was about 6 or 7 rem, a dose equivalent to 100 to 150 days of additional radiation exposure.
    • The rem takes account of a ‘quality factor’, which for the more dangerous alpha particles is 10.


1940s: acronym from roentgen equivalent man.

More definitions of REM

Definition of rem in: