Try Our Apps


The Best Internet Slang

nacreous cloud

a rarely seen, luminous, iridescent cloud shaped like a cirrus or altocumulus, approximately 15 miles (24 km) above the earth, and of unknown composition.
Also called mother-of-pearl cloud. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
nacreous cloud in Science
nacreous cloud
A cloud resembling a cirrus, showing iridescent coloration when the Sun is several degrees below the horizon. These clouds appear mostly during winter in regions of high latitude.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for nacreous cloud

Few English speakers likely know this word

Word Value for nacreous

Scrabble Words With Friends

Nearby words for nacreous cloud