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rem

1 American  
[rem] / rɛm /

noun

Nucleonics.

  1. the quantity of ionizing radiation whose biological effect is equal to that produced by one roentgen of x-rays.

REM 2 American  
[rem] / rɛm /

noun

  1. rapid eye movement.

REM 1 British  

abbreviation

  1. rapid eye movement

"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
REM 2 British  
/ rɛm /

acronym

  1. roentgen equivalent man

"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
rem Scientific  
/ 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.

rem Cultural  

  1. An acronym for r oentgen e quivalent m an. A unit of absorbed doses of radiation.

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A normal medical x-ray delivers about 0.02 rem; a fatal dose of radiation is several thousand rem.

Etymology

Origin of rem1

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

Origin of REM2

First recorded in 1955–60

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The findings support the idea that REM sleep, the rapid eye movement stage of sleep when vivid and sometimes lucid dreams occur, may be especially helpful for creative problem solving.

From Science Daily

During REM sleep, scientists replayed the soundtracks linked to half of the unsolved puzzles to selectively reactivate those memories.

From Science Daily

The study, "Creative problem-solving after experimentally provoking dreams of unsolved puzzles during REM sleep" was published in the journal Neuroscience of Consciousness on Feb. 5.

From Science Daily

A study from the University of Pennsylvania Perelman School of Medicine, published in the journal Sleep, found that pink noise reduced REM sleep and disrupted overall sleep recovery.

From Science Daily

"REM sleep is important for memory consolidation, emotional regulation and brain development, so our findings suggest that playing pink noise and other types of broadband noise during sleep could be harmful -- especially for children whose brains are still developing and who spend much more time in REM sleep than adults," said study lead author Mathias Basner, MD, PhD, professor of Sleep and Chronobiology in Psychiatry.

From Science Daily

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.