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rem

noun (1)
\ ˈrem How to pronounce rem (audio) \

Definition of rem

 (Entry 1 of 2)

: the dosage of an ionizing radiation that will cause the same biological effect as one roentgen of X-ray or gamma-ray exposure

REM

noun (2)
\ ˈrem How to pronounce REM (audio) , ˌär-ˌē-ˈem\

Definition of REM (Entry 2 of 2)

: rapid eye movement

First Known Use of rem

Noun (1)

1947, in the meaning defined above

Noun (2)

1957, in the meaning defined above

History and Etymology for rem

Noun (1)

roentgen equivalent man

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More Definitions for rem

rem

noun
\ ˈrem How to pronounce rem (audio) \

Medical Definition of rem

 (Entry 1 of 2)

: the dosage of an ionizing radiation that will cause the same biological effect as one roentgen of X-ray or gamma-ray dosage — compare rep

REM

noun
\ ˈrem How to pronounce REM (audio) \

Medical Definition of REM (Entry 2 of 2)

: rapid eye movement

More from Merriam-Webster on rem

Britannica.com: Encyclopedia article about rem

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