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rapid eye movement

rapidly shifting, continuous movements of the eyes beneath closed lids during the stage of sleep characterized by dreaming.
Also called REM.
Origin of rapid eye movement
1915-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for rapid-eye-movement

rapid eye movement

movement of the eyeballs under closed eyelids during paradoxical sleep, which occurs while the sleeper is dreaming REM
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
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rapid-eye-movement in Medicine

rapid eye movement n.

Abbr. REM The rapid periodic jerky movement of the eyes during certain stages of the sleep cycle when dreaming takes place.

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