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rem

[rem]
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noun Nucleonics.
  1. the quantity of ionizing radiation whose biological effect is equal to that produced by one roentgen of x-rays.
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Origin of rem

1945–50; r(oentgen) e(quivalent in) m(an)

REM

[rem]
noun
  1. rapid eye movement.
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Origin of REM

First recorded in 1955–60

ad rem

[ad rem; Latin ahd rem]
adjective
  1. relevant; pertinent: an ad rem remark.
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adverb
  1. without digressing; in a straightforward manner: to reply ad rem.
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Origin of ad rem

< Latin: literally, to the matter

in rem

[in rem]
adverb, adjective Law.
  1. (of a legal proceeding or judgment) directed against a thing, rather than against a person, as a legal proceeding for the recovery of property.
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Compare in personam.

Origin of in rem

1880–85; < Latin: literally, against (the) thing
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for rem

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British Dictionary definitions for rem

REM1

abbreviation for
  1. rapid eye movement
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REM2

rem

n acronym for
  1. roentgen equivalent man
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ad rem

adjective, adverb
  1. to the point; without digressionto reply ad rem; an ad rem discussion Compare ad hominem
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in rem

adjective
  1. law (of a judicial act) directed against property rather than against a specific personCompare in personam
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Word Origin

Latin, literally: against the matter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for rem

n.

"unit for measuring radiation," 1947, acronym of roentgen equivalent man.

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Online Etymology Dictionary, © 2010 Douglas Harper

rem in Medicine

rem

(rĕm)
n.
  1. The amount of ionizing radiation required to produce the same biological effect as one rad of high-penetration x-rays.
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REM

abbr.
  1. rapid eye movement
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

rem in Science

rem

[rĕm]
  1. The amount of ionizing radiation required to produce the same biological effect as one rad of high-penetration x-rays. The rem has been replaced in most scientific contexts by the sievert.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

rem in Culture

rem

An acronym for roentgen equivalent man. A unit of absorbed doses of radiation.

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Note

A normal medical x-ray delivers about 0.02 rem; a fatal dose of radiation is several thousand rem.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.