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What does “clement” mean?

Origin of rapid eye movement sleep

First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for rapid eye movement sleep

rapid eye movement sleep
[ răpĭd ]

See REM sleep.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.