rem

noun (1)
\ˈrem \

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, ˌär-ˌē-ˈem\

Definition of REM (Entry 2 of 2)

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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Time Traveler for rem

The first known use of rem was in 1947

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More Definitions for rem

rem

noun
\ˈrem \

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 \

Medical Definition of REM (Entry 2 of 2)

More from Merriam-Webster on rem

Britannica.com: Encyclopedia article about rem

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